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gerrit.named-data.net / ndn-cxx / f39a5362859e31b421ebe999758135836cb737e1 / . / include / ndnboost / lexical_cast.hpp
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#ifndef BOOST_LEXICAL_CAST_INCLUDED
#define BOOST_LEXICAL_CAST_INCLUDED
// MS compatible compilers support #pragma once
#if defined(_MSC_VER) && (_MSC_VER >= 1020)
# pragma once
#endif
// Boost lexical_cast.hpp header -------------------------------------------//
//
// See http://www.boost.org/libs/conversion for documentation.
// See end of this header for rights and permissions.
//
// what: lexical_cast custom keyword cast
// who: contributed by Kevlin Henney,
// enhanced with contributions from Terje Slettebo,
// with additional fixes and suggestions from Gennaro Prota,
// Beman Dawes, Dave Abrahams, Daryle Walker, Peter Dimov,
// Alexander Nasonov, Antony Polukhin, Justin Viiret, Michael Hofmann,
// Cheng Yang, Matthew Bradbury, David W. Birdsall, Pavel Korzh and other Boosters
// when: November 2000, March 2003, June 2005, June 2006, March 2011 - 2013
#include <ndnboost/config.hpp>
#if defined(BOOST_NO_STRINGSTREAM) || defined(BOOST_NO_STD_WSTRING)
#define BOOST_LCAST_NO_WCHAR_T
#endif
#include <climits>
#include <cstddef>
#include <string>
#include <cstring>
#include <cstdio>
#include <typeinfo>
#include <exception>
#include <ndnboost/limits.hpp>
#include <ndnboost/mpl/if.hpp>
#include <ndnboost/throw_exception.hpp>
#include <ndnboost/type_traits/ice.hpp>
#include <ndnboost/type_traits/is_pointer.hpp>
#include <ndnboost/static_assert.hpp>
#include <ndnboost/detail/lcast_precision.hpp>
#include <ndnboost/detail/workaround.hpp>
#ifndef BOOST_NO_STD_LOCALE
# include <locale>
#else
# ifndef BOOST_LEXICAL_CAST_ASSUME_C_LOCALE
// Getting error at this point means, that your STL library is old/lame/misconfigured.
// If nothing can be done with STL library, define BOOST_LEXICAL_CAST_ASSUME_C_LOCALE,
// but beware: lexical_cast will understand only 'C' locale delimeters and thousands
// separators.
# error "Unable to use <locale> header. Define BOOST_LEXICAL_CAST_ASSUME_C_LOCALE to force "
# error "ndnboost::lexical_cast to use only 'C' locale during conversions."
# endif
#endif
#ifdef BOOST_NO_STRINGSTREAM
#include <strstream>
#else
#include <sstream>
#endif
#ifdef BOOST_NO_TYPEID
#define BOOST_LCAST_THROW_BAD_CAST(S, T) throw_exception(bad_lexical_cast())
#else
#define BOOST_LCAST_THROW_BAD_CAST(Source, Target) \
throw_exception(bad_lexical_cast(typeid(Source), typeid(Target)))
#endif
#if (defined(BOOST_LCAST_HAS_INT128) && !defined(__GNUC__)) || GCC_VERSION > 40700
#define BOOST_LCAST_HAS_INT128
#endif
namespace ndnboost
{
// exception used to indicate runtime lexical_cast failure
class BOOST_SYMBOL_VISIBLE bad_lexical_cast :
// workaround MSVC bug with std::bad_cast when _HAS_EXCEPTIONS == 0
#if defined(BOOST_MSVC) && defined(_HAS_EXCEPTIONS) && !_HAS_EXCEPTIONS
public std::exception
#else
public std::bad_cast
#endif
#if defined(__BORLANDC__) && BOOST_WORKAROUND( __BORLANDC__, < 0x560 )
// under bcc32 5.5.1 bad_cast doesn't derive from exception
, public std::exception
#endif
{
public:
bad_lexical_cast() BOOST_NOEXCEPT :
#ifndef BOOST_NO_TYPEID
source(&typeid(void)), target(&typeid(void))
#else
source(0), target(0) // this breaks getters
#endif
{
}
bad_lexical_cast(
const std::type_info &source_type_arg,
const std::type_info &target_type_arg) BOOST_NOEXCEPT :
source(&source_type_arg), target(&target_type_arg)
{
}
const std::type_info &source_type() const
{
return *source;
}
const std::type_info &target_type() const
{
return *target;
}
#ifndef BOOST_NO_CXX11_NOEXCEPT
virtual const char *what() const noexcept
#else
virtual const char *what() const throw()
#endif
{
return "bad lexical cast: "
"source type value could not be interpreted as target";
}
#ifndef BOOST_NO_CXX11_NOEXCEPT
virtual ~bad_lexical_cast() BOOST_NOEXCEPT
#else
virtual ~bad_lexical_cast() throw()
#endif
{}
private:
const std::type_info *source;
const std::type_info *target;
};
namespace detail // widest_char
{
template <typename TargetChar, typename SourceChar>
struct widest_char
{
typedef BOOST_DEDUCED_TYPENAME ndnboost::mpl::if_c<
(sizeof(TargetChar) > sizeof(SourceChar))
, TargetChar
, SourceChar >::type type;
};
}
} // namespace ndnboost
#if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) && !defined(__SUNPRO_CC) && !defined(__PGIC__)
#include <cmath>
#include <istream>
#ifndef BOOST_NO_CXX11_HDR_ARRAY
#include <array>
#endif
#include <ndnboost/array.hpp>
#include <ndnboost/numeric/conversion/cast.hpp>
#include <ndnboost/type_traits/make_unsigned.hpp>
#include <ndnboost/type_traits/is_signed.hpp>
#include <ndnboost/type_traits/is_integral.hpp>
#include <ndnboost/type_traits/is_arithmetic.hpp>
#include <ndnboost/type_traits/remove_pointer.hpp>
#include <ndnboost/type_traits/has_left_shift.hpp>
#include <ndnboost/type_traits/has_right_shift.hpp>
#include <ndnboost/math/special_functions/sign.hpp>
#include <ndnboost/math/special_functions/fpclassify.hpp>
#include <ndnboost/range/iterator_range_core.hpp>
#include <ndnboost/container/container_fwd.hpp>
#include <ndnboost/integer.hpp>
#ifndef BOOST_NO_CWCHAR
# include <cwchar>
#endif
namespace ndnboost {
namespace detail // is_char_or_wchar<...>
{
// returns true, if T is one of the character types
template < typename T >
struct is_char_or_wchar
{
typedef ndnboost::type_traits::ice_or<
ndnboost::is_same< T, char >::value,
#ifndef BOOST_LCAST_NO_WCHAR_T
ndnboost::is_same< T, wchar_t >::value,
#endif
#ifndef BOOST_NO_CXX11_CHAR16_T
ndnboost::is_same< T, char16_t >::value,
#endif
#ifndef BOOST_NO_CXX11_CHAR32_T
ndnboost::is_same< T, char32_t >::value,
#endif
ndnboost::is_same< T, unsigned char >::value,
ndnboost::is_same< T, signed char >::value
> result_type;
BOOST_STATIC_CONSTANT(bool, value = (result_type::value) );
};
}
namespace detail // normalize_single_byte_char<Char>
{
// Converts signed/unsigned char to char
template < class Char >
struct normalize_single_byte_char
{
typedef Char type;
};
template <>
struct normalize_single_byte_char< signed char >
{
typedef char type;
};
template <>
struct normalize_single_byte_char< unsigned char >
{
typedef char type;
};
}
namespace detail // deduce_character_type_later<T>
{
// Helper type, meaning that stram character for T must be deduced
// at Stage 2 (See deduce_source_char<T> and deduce_target_char<T>)
template < class T > struct deduce_character_type_later {};
}
namespace detail // stream_char_common<T>
{
// Selectors to choose stream character type (common for Source and Target)
// Returns one of char, wchar_t, char16_t, char32_t or deduce_character_type_later<T> types
// Executed on Stage 1 (See deduce_source_char<T> and deduce_target_char<T>)
template < typename Type >
struct stream_char_common: public ndnboost::mpl::if_c<
ndnboost::detail::is_char_or_wchar< Type >::value,
Type,
ndnboost::detail::deduce_character_type_later< Type >
> {};
template < typename Char >
struct stream_char_common< Char* >: public ndnboost::mpl::if_c<
ndnboost::detail::is_char_or_wchar< Char >::value,
Char,
ndnboost::detail::deduce_character_type_later< Char* >
> {};
template < typename Char >
struct stream_char_common< const Char* >: public ndnboost::mpl::if_c<
ndnboost::detail::is_char_or_wchar< Char >::value,
Char,
ndnboost::detail::deduce_character_type_later< const Char* >
> {};
template < typename Char >
struct stream_char_common< ndnboost::iterator_range< Char* > >: public ndnboost::mpl::if_c<
ndnboost::detail::is_char_or_wchar< Char >::value,
Char,
ndnboost::detail::deduce_character_type_later< ndnboost::iterator_range< Char* > >
> {};
template < typename Char >
struct stream_char_common< ndnboost::iterator_range< const Char* > >: public ndnboost::mpl::if_c<
ndnboost::detail::is_char_or_wchar< Char >::value,
Char,
ndnboost::detail::deduce_character_type_later< ndnboost::iterator_range< const Char* > >
> {};
template < class Char, class Traits, class Alloc >
struct stream_char_common< std::basic_string< Char, Traits, Alloc > >
{
typedef Char type;
};
template < class Char, class Traits, class Alloc >
struct stream_char_common< ndnboost::container::basic_string< Char, Traits, Alloc > >
{
typedef Char type;
};
template < typename Char, std::size_t N >
struct stream_char_common< ndnboost::array< Char, N > >: public ndnboost::mpl::if_c<
ndnboost::detail::is_char_or_wchar< Char >::value,
Char,
ndnboost::detail::deduce_character_type_later< ndnboost::array< Char, N > >
> {};
template < typename Char, std::size_t N >
struct stream_char_common< ndnboost::array< const Char, N > >: public ndnboost::mpl::if_c<
ndnboost::detail::is_char_or_wchar< Char >::value,
Char,
ndnboost::detail::deduce_character_type_later< ndnboost::array< const Char, N > >
> {};
#ifndef BOOST_NO_CXX11_HDR_ARRAY
template < typename Char, std::size_t N >
struct stream_char_common< std::array<Char, N > >: public ndnboost::mpl::if_c<
ndnboost::detail::is_char_or_wchar< Char >::value,
Char,
ndnboost::detail::deduce_character_type_later< std::array< Char, N > >
> {};
template < typename Char, std::size_t N >
struct stream_char_common< std::array< const Char, N > >: public ndnboost::mpl::if_c<
ndnboost::detail::is_char_or_wchar< Char >::value,
Char,
ndnboost::detail::deduce_character_type_later< std::array< const Char, N > >
> {};
#endif
#ifdef BOOST_LCAST_HAS_INT128
template <> struct stream_char_common< ndnboost::int128_type >: public ndnboost::mpl::identity< char > {};
template <> struct stream_char_common< ndnboost::uint128_type >: public ndnboost::mpl::identity< char > {};
#endif
#if !defined(BOOST_LCAST_NO_WCHAR_T) && defined(BOOST_NO_INTRINSIC_WCHAR_T)
template <>
struct stream_char_common< wchar_t >
{
typedef char type;
};
#endif
}
namespace detail // deduce_source_char_impl<T>
{
// If type T is `deduce_character_type_later` type, then tries to deduce
// character type using ndnboost::has_left_shift<T> metafunction.
// Otherwise supplied type T is a character type, that must be normalized
// using normalize_single_byte_char<Char>.
// Executed at Stage 2 (See deduce_source_char<T> and deduce_target_char<T>)
template < class Char >
struct deduce_source_char_impl
{
typedef BOOST_DEDUCED_TYPENAME ndnboost::detail::normalize_single_byte_char< Char >::type type;
};
template < class T >
struct deduce_source_char_impl< deduce_character_type_later< T > >
{
typedef ndnboost::has_left_shift< std::basic_ostream< char >, T > result_t;
#if defined(BOOST_LCAST_NO_WCHAR_T)
BOOST_STATIC_ASSERT_MSG((result_t::value),
"Source type is not std::ostream`able and std::wostream`s are not supported by your STL implementation");
typedef char type;
#else
typedef BOOST_DEDUCED_TYPENAME ndnboost::mpl::if_c<
result_t::value, char, wchar_t
>::type type;
BOOST_STATIC_ASSERT_MSG((result_t::value || ndnboost::has_left_shift< std::basic_ostream< type >, T >::value),
"Source type is neither std::ostream`able nor std::wostream`able");
#endif
};
}
namespace detail // deduce_target_char_impl<T>
{
// If type T is `deduce_character_type_later` type, then tries to deduce
// character type using ndnboost::has_right_shift<T> metafunction.
// Otherwise supplied type T is a character type, that must be normalized
// using normalize_single_byte_char<Char>.
// Executed at Stage 2 (See deduce_source_char<T> and deduce_target_char<T>)
template < class Char >
struct deduce_target_char_impl
{
typedef BOOST_DEDUCED_TYPENAME normalize_single_byte_char< Char >::type type;
};
template < class T >
struct deduce_target_char_impl< deduce_character_type_later<T> >
{
typedef ndnboost::has_right_shift<std::basic_istream<char>, T > result_t;
#if defined(BOOST_LCAST_NO_WCHAR_T)
BOOST_STATIC_ASSERT_MSG((result_t::value),
"Target type is not std::istream`able and std::wistream`s are not supported by your STL implementation");
typedef char type;
#else
typedef BOOST_DEDUCED_TYPENAME ndnboost::mpl::if_c<
result_t::value, char, wchar_t
>::type type;
BOOST_STATIC_ASSERT_MSG((result_t::value || ndnboost::has_right_shift<std::basic_istream<wchar_t>, T >::value),
"Target type is neither std::istream`able nor std::wistream`able");
#endif
};
}
namespace detail // deduce_target_char<T> and deduce_source_char<T>
{
// We deduce stream character types in two stages.
//
// Stage 1 is common for Target and Source. At Stage 1 we get
// non normalized character type (may contain unsigned/signed char)
// or deduce_character_type_later<T> where T is the original type.
// Stage 1 is executed by stream_char_common<T>
//
// At Stage 2 we normalize character types or try to deduce character
// type using metafunctions.
// Stage 2 is executed by deduce_target_char_impl<T> and
// deduce_source_char_impl<T>
//
// deduce_target_char<T> and deduce_source_char<T> functions combine
// both stages
template < class T >
struct deduce_target_char
{
typedef BOOST_DEDUCED_TYPENAME stream_char_common< T >::type stage1_type;
typedef BOOST_DEDUCED_TYPENAME deduce_target_char_impl< stage1_type >::type stage2_type;
typedef stage2_type type;
};
template < class T >
struct deduce_source_char
{
typedef BOOST_DEDUCED_TYPENAME stream_char_common< T >::type stage1_type;
typedef BOOST_DEDUCED_TYPENAME deduce_source_char_impl< stage1_type >::type stage2_type;
typedef stage2_type type;
};
}
namespace detail // deduce_char_traits template
{
// We are attempting to get char_traits<> from Source or Tagret
// template parameter. Otherwise we'll be using std::char_traits<Char>
template < class Char, class Target, class Source >
struct deduce_char_traits
{
typedef std::char_traits< Char > type;
};
template < class Char, class Traits, class Alloc, class Source >
struct deduce_char_traits< Char
, std::basic_string< Char, Traits, Alloc >
, Source
>
{
typedef Traits type;
};
template < class Char, class Target, class Traits, class Alloc >
struct deduce_char_traits< Char
, Target
, std::basic_string< Char, Traits, Alloc >
>
{
typedef Traits type;
};
template < class Char, class Traits, class Alloc, class Source >
struct deduce_char_traits< Char
, ndnboost::container::basic_string< Char, Traits, Alloc >
, Source
>
{
typedef Traits type;
};
template < class Char, class Target, class Traits, class Alloc >
struct deduce_char_traits< Char
, Target
, ndnboost::container::basic_string< Char, Traits, Alloc >
>
{
typedef Traits type;
};
template < class Char, class Traits, class Alloc1, class Alloc2 >
struct deduce_char_traits< Char
, std::basic_string< Char, Traits, Alloc1 >
, std::basic_string< Char, Traits, Alloc2 >
>
{
typedef Traits type;
};
template<class Char, class Traits, class Alloc1, class Alloc2>
struct deduce_char_traits< Char
, ndnboost::container::basic_string< Char, Traits, Alloc1 >
, ndnboost::container::basic_string< Char, Traits, Alloc2 >
>
{
typedef Traits type;
};
template < class Char, class Traits, class Alloc1, class Alloc2 >
struct deduce_char_traits< Char
, ndnboost::container::basic_string< Char, Traits, Alloc1 >
, std::basic_string< Char, Traits, Alloc2 >
>
{
typedef Traits type;
};
template < class Char, class Traits, class Alloc1, class Alloc2 >
struct deduce_char_traits< Char
, std::basic_string< Char, Traits, Alloc1 >
, ndnboost::container::basic_string< Char, Traits, Alloc2 >
>
{
typedef Traits type;
};
}
namespace detail // array_to_pointer_decay<T>
{
template<class T>
struct array_to_pointer_decay
{
typedef T type;
};
template<class T, std::size_t N>
struct array_to_pointer_decay<T[N]>
{
typedef const T * type;
};
}
namespace detail // is_this_float_conversion_optimized<Float, Char>
{
// this metafunction evaluates to true, if we have optimized comnversion
// from Float type to Char array.
// Must be in sync with lexical_stream_limited_src<Char, ...>::shl_real_type(...)
template <typename Float, typename Char>
struct is_this_float_conversion_optimized
{
typedef ndnboost::type_traits::ice_and<
ndnboost::is_float<Float>::value,
#if !defined(BOOST_LCAST_NO_WCHAR_T) && !defined(BOOST_NO_SWPRINTF) && !defined(__MINGW32__)
ndnboost::type_traits::ice_or<
ndnboost::type_traits::ice_eq<sizeof(Char), sizeof(char) >::value,
ndnboost::is_same<Char, wchar_t>::value
>::value
#else
ndnboost::type_traits::ice_eq<sizeof(Char), sizeof(char) >::value
#endif
> result_type;
BOOST_STATIC_CONSTANT(bool, value = (result_type::value) );
};
}
namespace detail // lcast_src_length
{
// Return max. length of string representation of Source;
template< class Source // Source type of lexical_cast.
>
struct lcast_src_length
{
BOOST_STATIC_CONSTANT(std::size_t, value = 1);
// To check coverage, build the test with
// bjam --v2 profile optimization=off
static void check_coverage() {}
};
// Helper for integral types.
// Notes on length calculation:
// Max length for 32bit int with grouping "\1" and thousands_sep ',':
// "-2,1,4,7,4,8,3,6,4,7"
// ^ - is_signed
// ^ - 1 digit not counted by digits10
// ^^^^^^^^^^^^^^^^^^ - digits10 * 2
//
// Constant is_specialized is used instead of constant 1
// to prevent buffer overflow in a rare case when
// <ndnboost/limits.hpp> doesn't add missing specialization for
// numeric_limits<T> for some integral type T.
// When is_specialized is false, the whole expression is 0.
template<class Source>
struct lcast_src_length_integral
{
#ifndef BOOST_NO_LIMITS_COMPILE_TIME_CONSTANTS
BOOST_STATIC_CONSTANT(std::size_t, value =
std::numeric_limits<Source>::is_signed +
std::numeric_limits<Source>::is_specialized + /* == 1 */
std::numeric_limits<Source>::digits10 * 2
);
#else
BOOST_STATIC_CONSTANT(std::size_t, value = 156);
BOOST_STATIC_ASSERT(sizeof(Source) * CHAR_BIT <= 256);
#endif
};
#define BOOST_LCAST_DEF(T) \
template<> struct lcast_src_length<T> \
: lcast_src_length_integral<T> \
{ static void check_coverage() {} };
BOOST_LCAST_DEF(short)
BOOST_LCAST_DEF(unsigned short)
BOOST_LCAST_DEF(int)
BOOST_LCAST_DEF(unsigned int)
BOOST_LCAST_DEF(long)
BOOST_LCAST_DEF(unsigned long)
#if defined(BOOST_HAS_LONG_LONG)
BOOST_LCAST_DEF(ndnboost::ulong_long_type)
BOOST_LCAST_DEF(ndnboost::long_long_type )
#elif defined(BOOST_HAS_MS_INT64)
BOOST_LCAST_DEF(unsigned __int64)
BOOST_LCAST_DEF( __int64)
#endif
#ifdef BOOST_LCAST_HAS_INT128
BOOST_LCAST_DEF(ndnboost::int128_type)
BOOST_LCAST_DEF(ndnboost::uint128_type)
#endif
#undef BOOST_LCAST_DEF
#ifndef BOOST_LCAST_NO_COMPILE_TIME_PRECISION
// Helper for floating point types.
// -1.23456789e-123456
// ^ sign
// ^ leading digit
// ^ decimal point
// ^^^^^^^^ lcast_precision<Source>::value
// ^ "e"
// ^ exponent sign
// ^^^^^^ exponent (assumed 6 or less digits)
// sign + leading digit + decimal point + "e" + exponent sign == 5
template<class Source>
struct lcast_src_length_floating
{
BOOST_STATIC_ASSERT(
std::numeric_limits<Source>::max_exponent10 <= 999999L &&
std::numeric_limits<Source>::min_exponent10 >= -999999L
);
BOOST_STATIC_CONSTANT(std::size_t, value =
5 + lcast_precision<Source>::value + 6
);
};
template<>
struct lcast_src_length<float>
: lcast_src_length_floating<float>
{
static void check_coverage() {}
};
template<>
struct lcast_src_length<double>
: lcast_src_length_floating<double>
{
static void check_coverage() {}
};
template<>
struct lcast_src_length<long double>
: lcast_src_length_floating<long double>
{
static void check_coverage() {}
};
#endif // #ifndef BOOST_LCAST_NO_COMPILE_TIME_PRECISION
}
namespace detail // lexical_cast_stream_traits<Source, Target>
{
template <class Source, class Target>
struct lexical_cast_stream_traits {
typedef BOOST_DEDUCED_TYPENAME ndnboost::detail::array_to_pointer_decay<Source>::type src;
typedef BOOST_DEDUCED_TYPENAME ndnboost::remove_cv<src>::type no_cv_src;
typedef ndnboost::detail::deduce_source_char<no_cv_src> deduce_src_char_metafunc;
typedef BOOST_DEDUCED_TYPENAME deduce_src_char_metafunc::type src_char_t;
typedef BOOST_DEDUCED_TYPENAME ndnboost::detail::deduce_target_char<Target>::type target_char_t;
typedef BOOST_DEDUCED_TYPENAME ndnboost::detail::widest_char<
target_char_t, src_char_t
>::type char_type;
#if !defined(BOOST_NO_CXX11_CHAR16_T) && defined(BOOST_NO_CXX11_UNICODE_LITERALS)
BOOST_STATIC_ASSERT_MSG(( !ndnboost::is_same<char16_t, src_char_t>::value
&& !ndnboost::is_same<char16_t, target_char_t>::value),
"Your compiler does not have full support for char16_t" );
#endif
#if !defined(BOOST_NO_CXX11_CHAR32_T) && defined(BOOST_NO_CXX11_UNICODE_LITERALS)
BOOST_STATIC_ASSERT_MSG(( !ndnboost::is_same<char32_t, src_char_t>::value
&& !ndnboost::is_same<char32_t, target_char_t>::value),
"Your compiler does not have full support for char32_t" );
#endif
typedef BOOST_DEDUCED_TYPENAME ndnboost::detail::deduce_char_traits<
char_type, Target, no_cv_src
>::type traits;
typedef ndnboost::type_traits::ice_and<
ndnboost::is_same<char, src_char_t>::value, // source is not a wide character based type
ndnboost::type_traits::ice_ne<sizeof(char), sizeof(target_char_t) >::value, // target type is based on wide character
ndnboost::type_traits::ice_not<
ndnboost::detail::is_char_or_wchar<no_cv_src>::value // single character widening is optimized
>::value // and does not requires stringbuffer
> is_string_widening_required_t;
typedef ndnboost::type_traits::ice_not< ndnboost::type_traits::ice_or<
ndnboost::is_integral<no_cv_src>::value,
ndnboost::detail::is_this_float_conversion_optimized<no_cv_src, char_type >::value,
ndnboost::detail::is_char_or_wchar<
BOOST_DEDUCED_TYPENAME deduce_src_char_metafunc::stage1_type // if we did not get character type at stage1
>::value // then we have no optimization for that type
>::value > is_source_input_not_optimized_t;
// If we have an optimized conversion for
// Source, we do not need to construct stringbuf.
BOOST_STATIC_CONSTANT(bool, requires_stringbuf =
(ndnboost::type_traits::ice_or<
is_string_widening_required_t::value, is_source_input_not_optimized_t::value
>::value)
);
typedef ndnboost::detail::lcast_src_length<no_cv_src> len_t;
};
}
namespace detail // '0', '+' and '-' constants
{
template < typename Char > struct lcast_char_constants;
template<>
struct lcast_char_constants<char>
{
BOOST_STATIC_CONSTANT(char, zero = '0');
BOOST_STATIC_CONSTANT(char, minus = '-');
BOOST_STATIC_CONSTANT(char, plus = '+');
BOOST_STATIC_CONSTANT(char, lowercase_e = 'e');
BOOST_STATIC_CONSTANT(char, capital_e = 'E');
BOOST_STATIC_CONSTANT(char, c_decimal_separator = '.');
};
#ifndef BOOST_LCAST_NO_WCHAR_T
template<>
struct lcast_char_constants<wchar_t>
{
BOOST_STATIC_CONSTANT(wchar_t, zero = L'0');
BOOST_STATIC_CONSTANT(wchar_t, minus = L'-');
BOOST_STATIC_CONSTANT(wchar_t, plus = L'+');
BOOST_STATIC_CONSTANT(wchar_t, lowercase_e = L'e');
BOOST_STATIC_CONSTANT(wchar_t, capital_e = L'E');
BOOST_STATIC_CONSTANT(wchar_t, c_decimal_separator = L'.');
};
#endif
#if !defined(BOOST_NO_CXX11_CHAR16_T) && !defined(BOOST_NO_CXX11_UNICODE_LITERALS)
template<>
struct lcast_char_constants<char16_t>
{
BOOST_STATIC_CONSTANT(char16_t, zero = u'0');
BOOST_STATIC_CONSTANT(char16_t, minus = u'-');
BOOST_STATIC_CONSTANT(char16_t, plus = u'+');
BOOST_STATIC_CONSTANT(char16_t, lowercase_e = u'e');
BOOST_STATIC_CONSTANT(char16_t, capital_e = u'E');
BOOST_STATIC_CONSTANT(char16_t, c_decimal_separator = u'.');
};
#endif
#if !defined(BOOST_NO_CXX11_CHAR32_T) && !defined(BOOST_NO_CXX11_UNICODE_LITERALS)
template<>
struct lcast_char_constants<char32_t>
{
BOOST_STATIC_CONSTANT(char32_t, zero = U'0');
BOOST_STATIC_CONSTANT(char32_t, minus = U'-');
BOOST_STATIC_CONSTANT(char32_t, plus = U'+');
BOOST_STATIC_CONSTANT(char32_t, lowercase_e = U'e');
BOOST_STATIC_CONSTANT(char32_t, capital_e = U'E');
BOOST_STATIC_CONSTANT(char32_t, c_decimal_separator = U'.');
};
#endif
}
namespace detail // lcast_to_unsigned
{
template<class T>
inline
BOOST_DEDUCED_TYPENAME make_unsigned<T>::type lcast_to_unsigned(T value) BOOST_NOEXCEPT
{
typedef BOOST_DEDUCED_TYPENAME ndnboost::make_unsigned<T>::type result_type;
return static_cast<result_type>(
value < 0 ? 0u - static_cast<result_type>(value) : value
);
}
}
namespace detail // lcast_put_unsigned
{
template<class Traits, class T, class CharT>
CharT* lcast_put_unsigned(const T n_param, CharT* finish)
{
#ifndef BOOST_NO_LIMITS_COMPILE_TIME_CONSTANTS
BOOST_STATIC_ASSERT(!std::numeric_limits<T>::is_signed);
#endif
typedef typename Traits::int_type int_type;
CharT const czero = lcast_char_constants<CharT>::zero;
int_type const zero = Traits::to_int_type(czero);
BOOST_DEDUCED_TYPENAME ndnboost::mpl::if_c<
(sizeof(int_type) > sizeof(T))
, int_type
, T
>::type n = n_param;
#ifndef BOOST_LEXICAL_CAST_ASSUME_C_LOCALE
std::locale loc;
if (loc != std::locale::classic()) {
typedef std::numpunct<CharT> numpunct;
numpunct const& np = BOOST_USE_FACET(numpunct, loc);
std::string const grouping = np.grouping();
std::string::size_type const grouping_size = grouping.size();
if ( grouping_size && grouping[0] > 0 )
{
#ifndef BOOST_NO_LIMITS_COMPILE_TIME_CONSTANTS
// Check that ulimited group is unreachable:
BOOST_STATIC_ASSERT(std::numeric_limits<T>::digits10 < CHAR_MAX);
#endif
CharT thousands_sep = np.thousands_sep();
std::string::size_type group = 0; // current group number
char last_grp_size = grouping[0];
char left = last_grp_size;
do
{
if(left == 0)
{
++group;
if(group < grouping_size)
{
char const grp_size = grouping[group];
last_grp_size = grp_size <= 0 ? static_cast<char>(CHAR_MAX) : grp_size;
}
left = last_grp_size;
--finish;
Traits::assign(*finish, thousands_sep);
}
--left;
--finish;
int_type const digit = static_cast<int_type>(n % 10U);
Traits::assign(*finish, Traits::to_char_type(zero + digit));
n /= 10;
} while(n);
return finish;
}
}
#endif
{
do
{
--finish;
int_type const digit = static_cast<int_type>(n % 10U);
Traits::assign(*finish, Traits::to_char_type(zero + digit));
n /= 10;
} while(n);
}
return finish;
}
}
namespace detail // lcast_ret_unsigned
{
template<class Traits, class T, class CharT>
inline bool lcast_ret_unsigned(T& value, const CharT* const begin, const CharT* end)
{
#ifndef BOOST_NO_LIMITS_COMPILE_TIME_CONSTANTS
BOOST_STATIC_ASSERT(!std::numeric_limits<T>::is_signed);
#endif
CharT const czero = lcast_char_constants<CharT>::zero;
--end;
value = 0;
if (begin > end || *end < czero || *end >= czero + 10)
return false;
value = static_cast<T>(*end - czero);
--end;
T multiplier = 1;
bool multiplier_overflowed = false;
#ifndef BOOST_LEXICAL_CAST_ASSUME_C_LOCALE
std::locale loc;
if (loc != std::locale::classic()) {
typedef std::numpunct<CharT> numpunct;
numpunct const& np = BOOST_USE_FACET(numpunct, loc);
std::string const& grouping = np.grouping();
std::string::size_type const grouping_size = grouping.size();
/* According to Programming languages - C++
* we MUST check for correct grouping
*/
if (grouping_size && grouping[0] > 0)
{
unsigned char current_grouping = 0;
CharT const thousands_sep = np.thousands_sep();
char remained = static_cast<char>(grouping[current_grouping] - 1);
bool shall_we_return = true;
for(;end>=begin; --end)
{
if (remained) {
T const multiplier_10 = static_cast<T>(multiplier * 10);
if (multiplier_10 / 10 != multiplier) multiplier_overflowed = true;
T const dig_value = static_cast<T>(*end - czero);
T const new_sub_value = static_cast<T>(multiplier_10 * dig_value);
if (*end < czero || *end >= czero + 10
/* detecting overflow */
|| (dig_value && new_sub_value / dig_value != multiplier_10)
|| static_cast<T>((std::numeric_limits<T>::max)()-new_sub_value) < value
|| (multiplier_overflowed && dig_value)
)
return false;
value = static_cast<T>(value + new_sub_value);
multiplier = static_cast<T>(multiplier * 10);
--remained;
} else {
if ( !Traits::eq(*end, thousands_sep) ) //|| begin == end ) return false;
{
/*
* According to Programming languages - C++
* Digit grouping is checked. That is, the positions of discarded
* separators is examined for consistency with
* use_facet<numpunct<charT> >(loc ).grouping()
*
* BUT what if there is no separators at all and grouping()
* is not empty? Well, we have no extraced separators, so we
* won`t check them for consistency. This will allow us to
* work with "C" locale from other locales
*/
shall_we_return = false;
break;
} else {
if ( begin == end ) return false;
if (current_grouping < grouping_size-1 ) ++current_grouping;
remained = grouping[current_grouping];
}
}
}
if (shall_we_return) return true;
}
}
#endif
{
while ( begin <= end )
{
T const multiplier_10 = static_cast<T>(multiplier * 10);
if (multiplier_10 / 10 != multiplier) multiplier_overflowed = true;
T const dig_value = static_cast<T>(*end - czero);
T const new_sub_value = static_cast<T>(multiplier_10 * dig_value);
if (*end < czero || *end >= czero + 10
/* detecting overflow */
|| (dig_value && new_sub_value / dig_value != multiplier_10)
|| static_cast<T>((std::numeric_limits<T>::max)()-new_sub_value) < value
|| (multiplier_overflowed && dig_value)
)
return false;
value = static_cast<T>(value + new_sub_value);
multiplier = static_cast<T>(multiplier * 10);
--end;
}
}
return true;
}
}
namespace detail
{
template <class CharT>
bool lc_iequal(const CharT* val, const CharT* lcase, const CharT* ucase, unsigned int len) BOOST_NOEXCEPT {
for( unsigned int i=0; i < len; ++i ) {
if ( val[i] != lcase[i] && val[i] != ucase[i] ) return false;
}
return true;
}
/* Returns true and sets the correct value if found NaN or Inf. */
template <class CharT, class T>
inline bool parse_inf_nan_impl(const CharT* begin, const CharT* end, T& value
, const CharT* lc_NAN, const CharT* lc_nan
, const CharT* lc_INFINITY, const CharT* lc_infinity
, const CharT opening_brace, const CharT closing_brace) BOOST_NOEXCEPT
{
using namespace std;
if (begin == end) return false;
const CharT minus = lcast_char_constants<CharT>::minus;
const CharT plus = lcast_char_constants<CharT>::plus;
const int inifinity_size = 8;
bool has_minus = false;
/* Parsing +/- */
if( *begin == minus)
{
++ begin;
has_minus = true;
}
else if( *begin == plus ) ++begin;
if( end-begin < 3 ) return false;
if( lc_iequal(begin, lc_nan, lc_NAN, 3) )
{
begin += 3;
if (end != begin) /* It is 'nan(...)' or some bad input*/
{
if(end-begin<2) return false; // bad input
-- end;
if( *begin != opening_brace || *end != closing_brace) return false; // bad input
}
if( !has_minus ) value = std::numeric_limits<T>::quiet_NaN();
else value = (ndnboost::math::changesign) (std::numeric_limits<T>::quiet_NaN());
return true;
} else
if (( /* 'INF' or 'inf' */
end-begin==3
&&
lc_iequal(begin, lc_infinity, lc_INFINITY, 3)
)
||
( /* 'INFINITY' or 'infinity' */
end-begin==inifinity_size
&&
lc_iequal(begin, lc_infinity, lc_INFINITY, inifinity_size)
)
)
{
if( !has_minus ) value = std::numeric_limits<T>::infinity();
else value = (ndnboost::math::changesign) (std::numeric_limits<T>::infinity());
return true;
}
return false;
}
template <class CharT, class T>
bool put_inf_nan_impl(CharT* begin, CharT*& end, const T& value
, const CharT* lc_nan
, const CharT* lc_infinity) BOOST_NOEXCEPT
{
using namespace std;
const CharT minus = lcast_char_constants<CharT>::minus;
if ( (ndnboost::math::isnan)(value) )
{
if ( (ndnboost::math::signbit)(value) )
{
*begin = minus;
++ begin;
}
memcpy(begin, lc_nan, 3 * sizeof(CharT));
end = begin + 3;
return true;
} else if ( (ndnboost::math::isinf)(value) )
{
if ( (ndnboost::math::signbit)(value) )
{
*begin = minus;
++ begin;
}
memcpy(begin, lc_infinity, 3 * sizeof(CharT));
end = begin + 3;
return true;
}
return false;
}
#ifndef BOOST_LCAST_NO_WCHAR_T
template <class T>
bool parse_inf_nan(const wchar_t* begin, const wchar_t* end, T& value) BOOST_NOEXCEPT
{
return parse_inf_nan_impl(begin, end, value
, L"NAN", L"nan"
, L"INFINITY", L"infinity"
, L'(', L')');
}
template <class T>
bool put_inf_nan(wchar_t* begin, wchar_t*& end, const T& value) BOOST_NOEXCEPT
{
return put_inf_nan_impl(begin, end, value, L"nan", L"infinity");
}
#endif
#if !defined(BOOST_NO_CXX11_CHAR16_T) && !defined(BOOST_NO_CXX11_UNICODE_LITERALS)
template <class T>
bool parse_inf_nan(const char16_t* begin, const char16_t* end, T& value) BOOST_NOEXCEPT
{
return parse_inf_nan_impl(begin, end, value
, u"NAN", u"nan"
, u"INFINITY", u"infinity"
, u'(', u')');
}
template <class T>
bool put_inf_nan(char16_t* begin, char16_t*& end, const T& value) BOOST_NOEXCEPT
{
return put_inf_nan_impl(begin, end, value, u"nan", u"infinity");
}
#endif
#if !defined(BOOST_NO_CXX11_CHAR32_T) && !defined(BOOST_NO_CXX11_UNICODE_LITERALS)
template <class T>
bool parse_inf_nan(const char32_t* begin, const char32_t* end, T& value) BOOST_NOEXCEPT
{
return parse_inf_nan_impl(begin, end, value
, U"NAN", U"nan"
, U"INFINITY", U"infinity"
, U'(', U')');
}
template <class T>
bool put_inf_nan(char32_t* begin, char32_t*& end, const T& value) BOOST_NOEXCEPT
{
return put_inf_nan_impl(begin, end, value, U"nan", U"infinity");
}
#endif
template <class CharT, class T>
bool parse_inf_nan(const CharT* begin, const CharT* end, T& value) BOOST_NOEXCEPT
{
return parse_inf_nan_impl(begin, end, value
, "NAN", "nan"
, "INFINITY", "infinity"
, '(', ')');
}
template <class CharT, class T>
bool put_inf_nan(CharT* begin, CharT*& end, const T& value) BOOST_NOEXCEPT
{
return put_inf_nan_impl(begin, end, value, "nan", "infinity");
}
}
namespace detail // lcast_ret_float
{
// Silence buggy MS warnings like C4244: '+=' : conversion from 'int' to 'unsigned short', possible loss of data
#if defined(_MSC_VER) && (_MSC_VER == 1400)
# pragma warning(push)
# pragma warning(disable:4244)
#endif
template <class T>
struct mantissa_holder_type
{
/* Can not be used with this type */
};
template <>
struct mantissa_holder_type<float>
{
typedef unsigned int type;
typedef double wide_result_t;
};
template <>
struct mantissa_holder_type<double>
{
#ifndef BOOST_MATH_NO_LONG_DOUBLE_MATH_FUNCTIONS
typedef long double wide_result_t;
#if defined(BOOST_HAS_LONG_LONG)
typedef ndnboost::ulong_long_type type;
#elif defined(BOOST_HAS_MS_INT64)
typedef unsigned __int64 type;
#endif
#endif
};
template<class Traits, class T, class CharT>
inline bool lcast_ret_float(T& value, const CharT* begin, const CharT* end)
{
#ifndef BOOST_LEXICAL_CAST_ASSUME_C_LOCALE
std::locale loc;
typedef std::numpunct<CharT> numpunct;
numpunct const& np = BOOST_USE_FACET(numpunct, loc);
std::string const grouping(
(loc == std::locale::classic())
? std::string()
: np.grouping()
);
std::string::size_type const grouping_size = grouping.size();
CharT const thousands_sep = static_cast<CharT>(grouping_size ? np.thousands_sep() : 0);
CharT const decimal_point = np.decimal_point();
bool found_grouping = false;
std::string::size_type last_grouping_pos = grouping_size - 1;
#else
CharT const decimal_point = lcast_char_constants<CharT>::c_decimal_separator;
#endif
CharT const czero = lcast_char_constants<CharT>::zero;
CharT const minus = lcast_char_constants<CharT>::minus;
CharT const plus = lcast_char_constants<CharT>::plus;
CharT const capital_e = lcast_char_constants<CharT>::capital_e;
CharT const lowercase_e = lcast_char_constants<CharT>::lowercase_e;
value = static_cast<T>(0);
if (parse_inf_nan(begin, end, value)) return true;
typedef typename Traits::int_type int_type;
typedef BOOST_DEDUCED_TYPENAME mantissa_holder_type<T>::type mantissa_type;
typedef BOOST_DEDUCED_TYPENAME mantissa_holder_type<T>::wide_result_t wide_result_t;
int_type const zero = Traits::to_int_type(czero);
if (begin == end) return false;
/* Getting the plus/minus sign */
bool has_minus = false;
if (Traits::eq(*begin, minus) ) {
++ begin;
has_minus = true;
if (begin == end) return false;
} else if (Traits::eq(*begin, plus) ) {
++begin;
if (begin == end) return false;
}
bool found_decimal = false;
bool found_number_before_exp = false;
int pow_of_10 = 0;
mantissa_type mantissa=0;
bool is_mantissa_full = false;
char length_since_last_delim = 0;
while ( begin != end )
{
if (found_decimal) {
/* We allow no thousand_separators after decimal point */
mantissa_type tmp_mantissa = mantissa * 10u;
if (Traits::eq(*begin, lowercase_e) || Traits::eq(*begin, capital_e)) break;
if ( *begin < czero || *begin >= czero + 10 ) return false;
if ( is_mantissa_full
|| tmp_mantissa / 10u != mantissa
|| (std::numeric_limits<mantissa_type>::max)()-(*begin - zero) < tmp_mantissa
) {
is_mantissa_full = true;
++ begin;
continue;
}
-- pow_of_10;
mantissa = tmp_mantissa;
mantissa += *begin - zero;
found_number_before_exp = true;
} else {
if (*begin >= czero && *begin < czero + 10) {
/* Checking for mantissa overflow. If overflow will
* occur, them we only increase multiplyer
*/
mantissa_type tmp_mantissa = mantissa * 10u;
if( !is_mantissa_full
&& tmp_mantissa / 10u == mantissa
&& (std::numeric_limits<mantissa_type>::max)()-(*begin - zero) >= tmp_mantissa
)
{
mantissa = tmp_mantissa;
mantissa += *begin - zero;
} else
{
is_mantissa_full = true;
++ pow_of_10;
}
found_number_before_exp = true;
++ length_since_last_delim;
} else if (Traits::eq(*begin, decimal_point) || Traits::eq(*begin, lowercase_e) || Traits::eq(*begin, capital_e)) {
#ifndef BOOST_LEXICAL_CAST_ASSUME_C_LOCALE
/* If ( we need to check grouping
* and ( grouping missmatches
* or grouping position is incorrect
* or we are using the grouping position 0 twice
* )
* ) then return error
*/
if( grouping_size && found_grouping
&& (
length_since_last_delim != grouping[0]
|| last_grouping_pos>1
|| (last_grouping_pos==0 && grouping_size>1)
)
) return false;
#endif
if(Traits::eq(*begin, decimal_point)) {
++ begin;
found_decimal = true;
if (!found_number_before_exp && begin==end) return false;
continue;
}else {
if (!found_number_before_exp) return false;
break;
}
}
#ifndef BOOST_LEXICAL_CAST_ASSUME_C_LOCALE
else if (grouping_size && Traits::eq(*begin, thousands_sep)){
if(found_grouping)
{
/* It is not he first time, when we find thousands separator,
* so we need to chek, is the distance between two groupings
* equal to grouping[last_grouping_pos] */
if (length_since_last_delim != grouping[last_grouping_pos] )
{
if (!last_grouping_pos) return false;
else
{
-- last_grouping_pos;
if (length_since_last_delim != grouping[last_grouping_pos]) return false;
}
} else
/* We are calling the grouping[0] twice, when grouping size is more than 1 */
if (grouping_size>1u && last_grouping_pos+1<grouping_size) return false;
} else {
/* Delimiter at the begining ',000' */
if (!length_since_last_delim) return false;
found_grouping = true;
if (length_since_last_delim > grouping[last_grouping_pos] ) return false;
}
length_since_last_delim = 0;
++ begin;
/* Delimiter at the end '100,' */
if (begin == end) return false;
continue;
}
#endif
else return false;
}
++begin;
}
// Exponent found
if ( begin != end && (Traits::eq(*begin, lowercase_e) || Traits::eq(*begin, capital_e)) ) {
++ begin;
if ( begin == end ) return false;
bool exp_has_minus = false;
if(Traits::eq(*begin, minus)) {
exp_has_minus = true;
++ begin;
if ( begin == end ) return false;
} else if (Traits::eq(*begin, plus)) {
++ begin;
if ( begin == end ) return false;
}
int exp_pow_of_10 = 0;
while ( begin != end )
{
if ( *begin < czero
|| *begin >= czero + 10
|| exp_pow_of_10 * 10 < exp_pow_of_10) /* Overflows are checked lower more precisely*/
return false;
exp_pow_of_10 *= 10;
exp_pow_of_10 += *begin - zero;
++ begin;
};
if ( exp_pow_of_10 ) {
/* Overflows are checked lower */
if ( exp_has_minus ) {
pow_of_10 -= exp_pow_of_10;
} else {
pow_of_10 += exp_pow_of_10;
}
}
}
/* We need a more accurate algorithm... We can not use current algorithm
* with long doubles (and with doubles if sizeof(double)==sizeof(long double)).
*/
const wide_result_t result = std::pow(static_cast<wide_result_t>(10.0), pow_of_10) * mantissa;
value = static_cast<T>( has_minus ? (ndnboost::math::changesign)(result) : result);
if ( (ndnboost::math::isinf)(value) || (ndnboost::math::isnan)(value) ) return false;
return true;
}
// Unsilence buggy MS warnings like C4244: '+=' : conversion from 'int' to 'unsigned short', possible loss of data
#if defined(_MSC_VER) && (_MSC_VER == 1400)
# pragma warning(pop)
#endif
}
namespace detail // parser_buf
{
//
// class parser_buf:
// acts as a stream buffer which wraps around a pair of pointers
//
// This class is copied (and slightly changed) from
// boost/regex/v4/cpp_regex_traits.hpp
// Thanks John Maddock for it! (previous version had some
// problems with libc++ and some other STL implementations)
template <class BufferType, class charT>
class parser_buf : public BufferType {
typedef BufferType base_type;
typedef typename base_type::int_type int_type;
typedef typename base_type::char_type char_type;
typedef typename base_type::pos_type pos_type;
typedef ::std::streamsize streamsize;
typedef typename base_type::off_type off_type;
public:
parser_buf() : base_type() { setbuf(0, 0); }
const charT* getnext() { return this->gptr(); }
#ifndef BOOST_NO_USING_TEMPLATE
using base_type::pptr;
using base_type::pbase;
#else
charT* pptr() const { return base_type::pptr(); }
charT* pbase() const { return base_type::pbase(); }
#endif
base_type* setbuf(char_type* s, streamsize n) {
this->setg(s, s, s + n);
return this;
}
pos_type seekpos(pos_type sp, ::std::ios_base::openmode which) {
if(which & ::std::ios_base::out)
return pos_type(off_type(-1));
off_type size = static_cast<off_type>(this->egptr() - this->eback());
charT* g = this->eback();
if(off_type(sp) <= size)
{
this->setg(g, g + off_type(sp), g + size);
}
return pos_type(off_type(-1));
}
pos_type seekoff(off_type off, ::std::ios_base::seekdir way, ::std::ios_base::openmode which) {
typedef typename ndnboost::int_t<sizeof(way) * CHAR_BIT>::least cast_type;
if(which & ::std::ios_base::out)
return pos_type(off_type(-1));
std::ptrdiff_t size = this->egptr() - this->eback();
std::ptrdiff_t pos = this->gptr() - this->eback();
charT* g = this->eback();
switch(static_cast<cast_type>(way))
{
case ::std::ios_base::beg:
if((off < 0) || (off > size))
return pos_type(off_type(-1));
else
this->setg(g, g + off, g + size);
break;
case ::std::ios_base::end:
if((off < 0) || (off > size))
return pos_type(off_type(-1));
else
this->setg(g, g + size - off, g + size);
break;
case ::std::ios_base::cur:
{
std::ptrdiff_t newpos = static_cast<std::ptrdiff_t>(pos + off);
if((newpos < 0) || (newpos > size))
return pos_type(off_type(-1));
else
this->setg(g, g + newpos, g + size);
break;
}
default: ;
}
#ifdef BOOST_MSVC
#pragma warning(push)
#pragma warning(disable:4244)
#endif
return static_cast<pos_type>(this->gptr() - this->eback());
#ifdef BOOST_MSVC
#pragma warning(pop)
#endif
}
private:
parser_buf& operator=(const parser_buf&);
parser_buf(const parser_buf&);
};
}
namespace detail
{
struct do_not_construct_out_stream_t{};
}
namespace detail // optimized stream wrapper
{
// String representation of Source has an upper limit.
template< class CharT // a result of widest_char transformation
, class Traits // usually char_traits<CharT>
, bool RequiresStringbuffer
>
class lexical_stream_limited_src
{
#if defined(BOOST_NO_STRINGSTREAM)
typedef std::ostrstream out_stream_t;
#elif defined(BOOST_NO_STD_LOCALE)
typedef std::ostringstream out_stream_t;
typedef parser_buf<std::streambuf, char> buffer_t;
#else
typedef std::basic_ostringstream<CharT, Traits> out_stream_t;
typedef parser_buf<std::basic_streambuf<CharT, Traits>, CharT> buffer_t;
#endif
typedef BOOST_DEDUCED_TYPENAME ndnboost::mpl::if_c<
RequiresStringbuffer,
out_stream_t,
do_not_construct_out_stream_t
>::type deduced_out_stream_t;
// A string representation of Source is written to [start, finish).
CharT* start;
CharT* finish;
deduced_out_stream_t out_stream;
public:
lexical_stream_limited_src(CharT* sta, CharT* fin) BOOST_NOEXCEPT
: start(sta)
, finish(fin)
{}
private:
// Undefined:
lexical_stream_limited_src(lexical_stream_limited_src const&);
void operator=(lexical_stream_limited_src const&);
/************************************ HELPER FUNCTIONS FOR OPERATORS << ( ... ) ********************************/
bool shl_char(CharT ch) BOOST_NOEXCEPT
{
Traits::assign(*start, ch);
finish = start + 1;
return true;
}
#ifndef BOOST_LCAST_NO_WCHAR_T
template <class T>
bool shl_char(T ch)
{
BOOST_STATIC_ASSERT_MSG(( sizeof(T) <= sizeof(CharT)) ,
"ndnboost::lexical_cast does not support narrowing of char types."
"Use ndnboost::locale instead" );
#ifndef BOOST_LEXICAL_CAST_ASSUME_C_LOCALE
std::locale loc;
CharT const w = BOOST_USE_FACET(std::ctype<CharT>, loc).widen(ch);
#else
CharT const w = static_cast<CharT>(ch);
#endif
Traits::assign(*start, w);
finish = start + 1;
return true;
}
#endif
bool shl_char_array(CharT const* str) BOOST_NOEXCEPT
{
start = const_cast<CharT*>(str);
finish = start + Traits::length(str);
return true;
}
template <class T>
bool shl_char_array(T const* str)
{
BOOST_STATIC_ASSERT_MSG(( sizeof(T) <= sizeof(CharT)),
"ndnboost::lexical_cast does not support narrowing of char types."
"Use ndnboost::locale instead" );
return shl_input_streamable(str);
}
bool shl_char_array_limited(CharT const* str, std::size_t max_size) BOOST_NOEXCEPT
{
start = const_cast<CharT*>(str);
finish = std::find(start, start + max_size, Traits::to_char_type(0));
return true;
}
template<typename InputStreamable>
bool shl_input_streamable(InputStreamable& input)
{
#if defined(BOOST_NO_STRINGSTREAM) || defined(BOOST_NO_STD_LOCALE)
// If you have compilation error at this point, than your STL library
// does not support such conversions. Try updating it.
BOOST_STATIC_ASSERT((ndnboost::is_same<char, CharT>::value));
#endif
bool const result = !(out_stream << input).fail();
const buffer_t* const p = static_cast<buffer_t*>(
static_cast<std::basic_streambuf<CharT, Traits>*>(out_stream.rdbuf())
);
start = p->pbase();
finish = p->pptr();
return result;
}
template <class T>
inline bool shl_signed(T n)
{
start = lcast_put_unsigned<Traits>(lcast_to_unsigned(n), finish);
if(n < 0)
{
--start;
CharT const minus = lcast_char_constants<CharT>::minus;
Traits::assign(*start, minus);
}
return true;
}
template <class T, class SomeCharT>
bool shl_real_type(const T& val, SomeCharT* begin, SomeCharT*& end)
{
if (put_inf_nan(begin, end, val)) return true;
lcast_set_precision(out_stream, &val);
return shl_input_streamable(val);
}
static bool shl_real_type(float val, char* begin, char*& end)
{ using namespace std;
if (put_inf_nan(begin, end, val)) return true;
const double val_as_double = val;
end = begin +
#if defined(_MSC_VER) && (_MSC_VER >= 1400) && !defined(__SGI_STL_PORT) && !defined(_STLPORT_VERSION)
sprintf_s(begin, end-begin,
#else
sprintf(begin,
#endif
"%.*g", static_cast<int>(ndnboost::detail::lcast_get_precision<float>()), val_as_double);
return end > begin;
}
static bool shl_real_type(double val, char* begin, char*& end)
{ using namespace std;
if (put_inf_nan(begin, end, val)) return true;
end = begin +
#if defined(_MSC_VER) && (_MSC_VER >= 1400) && !defined(__SGI_STL_PORT) && !defined(_STLPORT_VERSION)
sprintf_s(begin, end-begin,
#else
sprintf(begin,
#endif
"%.*g", static_cast<int>(ndnboost::detail::lcast_get_precision<double>()), val);
return end > begin;
}
#ifndef __MINGW32__
static bool shl_real_type(long double val, char* begin, char*& end)
{ using namespace std;
if (put_inf_nan(begin, end, val)) return true;
end = begin +
#if defined(_MSC_VER) && (_MSC_VER >= 1400) && !defined(__SGI_STL_PORT) && !defined(_STLPORT_VERSION)
sprintf_s(begin, end-begin,
#else
sprintf(begin,
#endif
"%.*Lg", static_cast<int>(ndnboost::detail::lcast_get_precision<long double>()), val );
return end > begin;
}
#endif
#if !defined(BOOST_LCAST_NO_WCHAR_T) && !defined(BOOST_NO_SWPRINTF) && !defined(__MINGW32__)
static bool shl_real_type(float val, wchar_t* begin, wchar_t*& end)
{ using namespace std;
if (put_inf_nan(begin, end, val)) return true;
const double val_as_double = val;
end = begin + swprintf(begin, end-begin,
L"%.*g",
static_cast<int>(ndnboost::detail::lcast_get_precision<float >()),
val_as_double );
return end > begin;
}
static bool shl_real_type(double val, wchar_t* begin, wchar_t*& end)
{ using namespace std;
if (put_inf_nan(begin, end, val)) return true;
end = begin + swprintf(begin, end-begin,
L"%.*g", static_cast<int>(ndnboost::detail::lcast_get_precision<double >()), val );
return end > begin;
}
static bool shl_real_type(long double val, wchar_t* begin, wchar_t*& end)
{ using namespace std;
if (put_inf_nan(begin, end, val)) return true;
end = begin + swprintf(begin, end-begin,
L"%.*Lg", static_cast<int>(ndnboost::detail::lcast_get_precision<long double >()), val );
return end > begin;
}
#endif
/************************************ OPERATORS << ( ... ) ********************************/
public:
template<class Alloc>
bool operator<<(std::basic_string<CharT,Traits,Alloc> const& str) BOOST_NOEXCEPT
{
start = const_cast<CharT*>(str.data());
finish = start + str.length();
return true;
}
template<class Alloc>
bool operator<<(ndnboost::container::basic_string<CharT,Traits,Alloc> const& str) BOOST_NOEXCEPT
{
start = const_cast<CharT*>(str.data());
finish = start + str.length();
return true;
}
bool operator<<(bool value) BOOST_NOEXCEPT
{
CharT const czero = lcast_char_constants<CharT>::zero;
Traits::assign(*start, Traits::to_char_type(czero + value));
finish = start + 1;
return true;
}
bool operator<<(const iterator_range<CharT*>& rng) BOOST_NOEXCEPT
{
start = rng.begin();
finish = rng.end();
return true;
}
bool operator<<(const iterator_range<const CharT*>& rng) BOOST_NOEXCEPT
{
start = const_cast<CharT*>(rng.begin());
finish = const_cast<CharT*>(rng.end());
return true;
}
bool operator<<(const iterator_range<const signed char*>& rng) BOOST_NOEXCEPT
{
return (*this) << iterator_range<char*>(
const_cast<char*>(reinterpret_cast<const char*>(rng.begin())),
const_cast<char*>(reinterpret_cast<const char*>(rng.end()))
);
}
bool operator<<(const iterator_range<const unsigned char*>& rng) BOOST_NOEXCEPT
{
return (*this) << iterator_range<char*>(
const_cast<char*>(reinterpret_cast<const char*>(rng.begin())),
const_cast<char*>(reinterpret_cast<const char*>(rng.end()))
);
}
bool operator<<(const iterator_range<signed char*>& rng) BOOST_NOEXCEPT
{
return (*this) << iterator_range<char*>(
reinterpret_cast<char*>(rng.begin()),
reinterpret_cast<char*>(rng.end())
);
}
bool operator<<(const iterator_range<unsigned char*>& rng) BOOST_NOEXCEPT
{
return (*this) << iterator_range<char*>(
reinterpret_cast<char*>(rng.begin()),
reinterpret_cast<char*>(rng.end())
);
}
bool operator<<(char ch) { return shl_char(ch); }
bool operator<<(unsigned char ch) { return ((*this) << static_cast<char>(ch)); }
bool operator<<(signed char ch) { return ((*this) << static_cast<char>(ch)); }
#if !defined(BOOST_LCAST_NO_WCHAR_T)
bool operator<<(wchar_t const* str) { return shl_char_array(str); }
bool operator<<(wchar_t * str) { return shl_char_array(str); }
#ifndef BOOST_NO_INTRINSIC_WCHAR_T
bool operator<<(wchar_t ch) { return shl_char(ch); }
#endif
#endif
#if !defined(BOOST_NO_CXX11_CHAR16_T) && !defined(BOOST_NO_CXX11_UNICODE_LITERALS)
bool operator<<(char16_t ch) { return shl_char(ch); }
bool operator<<(char16_t * str) { return shl_char_array(str); }
bool operator<<(char16_t const * str) { return shl_char_array(str); }
#endif
#if !defined(BOOST_NO_CXX11_CHAR32_T) && !defined(BOOST_NO_CXX11_UNICODE_LITERALS)
bool operator<<(char32_t ch) { return shl_char(ch); }
bool operator<<(char32_t * str) { return shl_char_array(str); }
bool operator<<(char32_t const * str) { return shl_char_array(str); }
#endif
bool operator<<(unsigned char const* ch) { return ((*this) << reinterpret_cast<char const*>(ch)); }
bool operator<<(unsigned char * ch) { return ((*this) << reinterpret_cast<char *>(ch)); }
bool operator<<(signed char const* ch) { return ((*this) << reinterpret_cast<char const*>(ch)); }
bool operator<<(signed char * ch) { return ((*this) << reinterpret_cast<char *>(ch)); }
bool operator<<(char const* str) { return shl_char_array(str); }
bool operator<<(char* str) { return shl_char_array(str); }
bool operator<<(short n) { return shl_signed(n); }
bool operator<<(int n) { return shl_signed(n); }
bool operator<<(long n) { return shl_signed(n); }
bool operator<<(unsigned short n) { start = lcast_put_unsigned<Traits>(n, finish); return true; }
bool operator<<(unsigned int n) { start = lcast_put_unsigned<Traits>(n, finish); return true; }
bool operator<<(unsigned long n) { start = lcast_put_unsigned<Traits>(n, finish); return true; }
#if defined(BOOST_HAS_LONG_LONG)
bool operator<<(ndnboost::ulong_long_type n) { start = lcast_put_unsigned<Traits>(n, finish); return true; }
bool operator<<(ndnboost::long_long_type n) { return shl_signed(n); }
#elif defined(BOOST_HAS_MS_INT64)
bool operator<<(unsigned __int64 n) { start = lcast_put_unsigned<Traits>(n, finish); return true; }
bool operator<<( __int64 n) { return shl_signed(n); }
#endif
#ifdef BOOST_LCAST_HAS_INT128
bool operator<<(const ndnboost::uint128_type& n) { start = lcast_put_unsigned<Traits>(n, finish); return true; }
bool operator<<(const ndnboost::int128_type& n) { return shl_signed(n); }
#endif
bool operator<<(float val) { return shl_real_type(val, start, finish); }
bool operator<<(double val) { return shl_real_type(val, start, finish); }
bool operator<<(long double val) {
#ifndef __MINGW32__
return shl_real_type(val, start, finish);
#else
return shl_real_type(static_cast<double>(val), start, finish);
#endif
}
template <std::size_t N>
bool operator<<(ndnboost::array<CharT, N> const& input) BOOST_NOEXCEPT
{ return shl_char_array_limited(input.begin(), N); }
template <std::size_t N>
bool operator<<(ndnboost::array<unsigned char, N> const& input) BOOST_NOEXCEPT
{ return ((*this) << reinterpret_cast<ndnboost::array<char, N> const& >(input)); }
template <std::size_t N>
bool operator<<(ndnboost::array<signed char, N> const& input) BOOST_NOEXCEPT
{ return ((*this) << reinterpret_cast<ndnboost::array<char, N> const& >(input)); }
template <std::size_t N>
bool operator<<(ndnboost::array<const CharT, N> const& input) BOOST_NOEXCEPT
{ return shl_char_array_limited(input.begin(), N); }
template <std::size_t N>
bool operator<<(ndnboost::array<const unsigned char, N> const& input) BOOST_NOEXCEPT
{ return ((*this) << reinterpret_cast<ndnboost::array<const char, N> const& >(input)); }
template <std::size_t N>
bool operator<<(ndnboost::array<const signed char, N> const& input) BOOST_NOEXCEPT
{ return ((*this) << reinterpret_cast<ndnboost::array<const char, N> const& >(input)); }
#ifndef BOOST_NO_CXX11_HDR_ARRAY
template <std::size_t N>
bool operator<<(std::array<CharT, N> const& input) BOOST_NOEXCEPT
{
if (input.size()) return shl_char_array_limited(&input[0], N);
else return true;
}
template <std::size_t N>
bool operator<<(std::array<unsigned char, N> const& input) BOOST_NOEXCEPT
{ return ((*this) << reinterpret_cast<ndnboost::array<char, N> const& >(input)); }
template <std::size_t N>
bool operator<<(std::array<signed char, N> const& input) BOOST_NOEXCEPT
{ return ((*this) << reinterpret_cast<ndnboost::array<char, N> const& >(input)); }
template <std::size_t N>
bool operator<<(std::array<const CharT, N> const& input) BOOST_NOEXCEPT
{
if (input.size()) return shl_char_array_limited(&input[0], N);
else return true;
}
template <std::size_t N>
bool operator<<(std::array<const unsigned char, N> const& input) BOOST_NOEXCEPT
{ return ((*this) << reinterpret_cast<ndnboost::array<const char, N> const& >(input)); }
template <std::size_t N>
bool operator<<(std::array<const signed char, N> const& input) BOOST_NOEXCEPT
{ return ((*this) << reinterpret_cast<ndnboost::array<const char, N> const& >(input)); }
#endif
template <class InStreamable>
bool operator<<(const InStreamable& input) { return shl_input_streamable(input); }
/************************************ HELPER FUNCTIONS FOR OPERATORS >> ( ... ) ********************************/
private:
template <typename Type>
bool shr_unsigned(Type& output)
{
if (start == finish) return false;
CharT const minus = lcast_char_constants<CharT>::minus;
CharT const plus = lcast_char_constants<CharT>::plus;
bool has_minus = false;
/* We won`t use `start' any more, so no need in decrementing it after */
if ( Traits::eq(minus,*start) )
{
++start;
has_minus = true;
} else if ( Traits::eq( plus, *start ) )
{
++start;
}
bool const succeed = lcast_ret_unsigned<Traits>(output, start, finish);
if (has_minus) {
output = static_cast<Type>(0u - output);
}
return succeed;
}
template <typename Type>
bool shr_signed(Type& output)
{
if (start == finish) return false;
CharT const minus = lcast_char_constants<CharT>::minus;
CharT const plus = lcast_char_constants<CharT>::plus;
typedef BOOST_DEDUCED_TYPENAME make_unsigned<Type>::type utype;
utype out_tmp =0;
bool has_minus = false;
/* We won`t use `start' any more, so no need in decrementing it after */
if ( Traits::eq(minus,*start) )
{
++start;
has_minus = true;
} else if ( Traits::eq(plus, *start) )
{
++start;
}
bool succeed = lcast_ret_unsigned<Traits>(out_tmp, start, finish);
if (has_minus) {
utype const comp_val = (static_cast<utype>(1) << std::numeric_limits<Type>::digits);
succeed = succeed && out_tmp<=comp_val;
output = static_cast<Type>(0u - out_tmp);
} else {
utype const comp_val = static_cast<utype>((std::numeric_limits<Type>::max)());
succeed = succeed && out_tmp<=comp_val;
output = out_tmp;
}
return succeed;
}
template<typename InputStreamable>
bool shr_using_base_class(InputStreamable& output)
{
BOOST_STATIC_ASSERT_MSG(
(!ndnboost::is_pointer<InputStreamable>::value),
"ndnboost::lexical_cast can not convert to pointers"
);
#if defined(BOOST_NO_STRINGSTREAM) || defined(BOOST_NO_STD_LOCALE)
BOOST_STATIC_ASSERT_MSG((ndnboost::is_same<char, CharT>::value),
"ndnboost::lexical_cast can not convert, because your STL library does not "
"support such conversions. Try updating it."
);
#endif
#if defined(BOOST_NO_STRINGSTREAM)
std::istrstream stream(start, finish - start);
#else
buffer_t buf;
buf.setbuf(start, finish - start);
#if defined(BOOST_NO_STD_LOCALE)
std::istream stream(&buf);
#else
std::basic_istream<CharT, Traits> stream(&buf);
#endif // BOOST_NO_STD_LOCALE
#endif // BOOST_NO_STRINGSTREAM
stream.unsetf(std::ios::skipws);
lcast_set_precision(stream, static_cast<InputStreamable*>(0));
return stream >> output &&
stream.get() ==
#if defined(__GNUC__) && (__GNUC__<3) && defined(BOOST_NO_STD_WSTRING)
// GCC 2.9x lacks std::char_traits<>::eof().
// We use BOOST_NO_STD_WSTRING to filter out STLport and libstdc++-v3
// configurations, which do provide std::char_traits<>::eof().
EOF;
#else
Traits::eof();
#endif
}
template<class T>
inline bool shr_xchar(T& output)
{
BOOST_STATIC_ASSERT_MSG(( sizeof(CharT) == sizeof(T) ),
"ndnboost::lexical_cast does not support narrowing of character types."
"Use ndnboost::locale instead" );
bool const ok = (finish - start == 1);
if (ok) {
CharT out;
Traits::assign(out, *start);
output = static_cast<T>(out);
}
return ok;
}
/************************************ OPERATORS >> ( ... ) ********************************/
public:
bool operator>>(unsigned short& output) { return shr_unsigned(output); }
bool operator>>(unsigned int& output) { return shr_unsigned(output); }
bool operator>>(unsigned long int& output) { return shr_unsigned(output); }
bool operator>>(short& output) { return shr_signed(output); }
bool operator>>(int& output) { return shr_signed(output); }
bool operator>>(long int& output) { return shr_signed(output); }
#if defined(BOOST_HAS_LONG_LONG)
bool operator>>(ndnboost::ulong_long_type& output) { return shr_unsigned(output); }
bool operator>>(ndnboost::long_long_type& output) { return shr_signed(output); }
#elif defined(BOOST_HAS_MS_INT64)
bool operator>>(unsigned __int64& output) { return shr_unsigned(output); }
bool operator>>(__int64& output) { return shr_signed(output); }
#endif
#ifdef BOOST_LCAST_HAS_INT128
bool operator>>(ndnboost::uint128_type& output) { return shr_unsigned(output); }
bool operator>>(ndnboost::int128_type& output) { return shr_signed(output); }
#endif
bool operator>>(char& output) { return shr_xchar(output); }
bool operator>>(unsigned char& output) { return shr_xchar(output); }
bool operator>>(signed char& output) { return shr_xchar(output); }
#if !defined(BOOST_LCAST_NO_WCHAR_T) && !defined(BOOST_NO_INTRINSIC_WCHAR_T)
bool operator>>(wchar_t& output) { return shr_xchar(output); }
#endif
#if !defined(BOOST_NO_CXX11_CHAR16_T) && !defined(BOOST_NO_CXX11_UNICODE_LITERALS)
bool operator>>(char16_t& output) { return shr_xchar(output); }
#endif
#if !defined(BOOST_NO_CXX11_CHAR32_T) && !defined(BOOST_NO_CXX11_UNICODE_LITERALS)
bool operator>>(char32_t& output) { return shr_xchar(output); }
#endif
template<class Alloc>
bool operator>>(std::basic_string<CharT,Traits,Alloc>& str) { str.assign(start, finish); return true; }
template<class Alloc>
bool operator>>(ndnboost::container::basic_string<CharT,Traits,Alloc>& str) { str.assign(start, finish); return true; }
private:
template <std::size_t N, class ArrayT>
bool shr_std_array(ArrayT& output) BOOST_NOEXCEPT
{
using namespace std;
const std::size_t size = finish - start;
if (size > N - 1) { // `-1` because we need to store \0 at the end
return false;
}
memcpy(&output[0], start, size * sizeof(CharT));
output[size] = Traits::to_char_type(0);
return true;
}
public:
template <std::size_t N>
bool operator>>(ndnboost::array<CharT, N>& output) BOOST_NOEXCEPT
{
return shr_std_array<N>(output);
}
template <std::size_t N>
bool operator>>(ndnboost::array<unsigned char, N>& output)
{
return ((*this) >> reinterpret_cast<ndnboost::array<char, N>& >(output));
}
template <std::size_t N>
bool operator>>(ndnboost::array<signed char, N>& output)
{
return ((*this) >> reinterpret_cast<ndnboost::array<char, N>& >(output));
}
#ifndef BOOST_NO_CXX11_HDR_ARRAY
template <std::size_t N>
bool operator>>(std::array<CharT, N>& output) BOOST_NOEXCEPT
{
return shr_std_array<N>(output);
}
template <std::size_t N>
bool operator>>(std::array<unsigned char, N>& output)
{
return ((*this) >> reinterpret_cast<std::array<char, N>& >(output));
}
template <std::size_t N>
bool operator>>(std::array<signed char, N>& output)
{
return ((*this) >> reinterpret_cast<std::array<char, N>& >(output));
}
#endif
/*
* case "-0" || "0" || "+0" : output = false; return true;
* case "1" || "+1": output = true; return true;
* default: return false;
*/
bool operator>>(bool& output) BOOST_NOEXCEPT
{
CharT const zero = lcast_char_constants<CharT>::zero;
CharT const plus = lcast_char_constants<CharT>::plus;
CharT const minus = lcast_char_constants<CharT>::minus;
switch(finish-start)
{
case 1:
output = Traits::eq(start[0], zero+1);
return output || Traits::eq(start[0], zero );
case 2:
if ( Traits::eq( plus, *start) )
{
++start;
output = Traits::eq(start[0], zero +1);
return output || Traits::eq(start[0], zero );
} else
{
output = false;
return Traits::eq( minus, *start)
&& Traits::eq( zero, start[1]);
}
default:
output = false; // Suppress warning about uninitalized variable
return false;
}
}
bool operator>>(float& output) { return lcast_ret_float<Traits>(output,start,finish); }
private:
// Not optimised converter
template <class T>
bool float_types_converter_internal(T& output, int /*tag*/) {
if (parse_inf_nan(start, finish, output)) return true;
bool return_value = shr_using_base_class(output);
/* Some compilers and libraries successfully
* parse 'inf', 'INFINITY', '1.0E', '1.0E-'...
* We are trying to provide a unified behaviour,
* so we just forbid such conversions (as some
* of the most popular compilers/libraries do)
* */
CharT const minus = lcast_char_constants<CharT>::minus;
CharT const plus = lcast_char_constants<CharT>::plus;
CharT const capital_e = lcast_char_constants<CharT>::capital_e;
CharT const lowercase_e = lcast_char_constants<CharT>::lowercase_e;
if ( return_value &&
(
Traits::eq(*(finish-1), lowercase_e) // 1.0e
|| Traits::eq(*(finish-1), capital_e) // 1.0E
|| Traits::eq(*(finish-1), minus) // 1.0e- or 1.0E-
|| Traits::eq(*(finish-1), plus) // 1.0e+ or 1.0E+
)
) return false;
return return_value;
}
// Optimised converter
bool float_types_converter_internal(double& output,char /*tag*/) {
return lcast_ret_float<Traits>(output,start,finish);
}
public:
bool operator>>(double& output)
{
/*
* Some compilers implement long double as double. In that case these types have
* same size, same precision, same max and min values... And it means,
* that current implementation of lcast_ret_float cannot be used for type
* double, because it will give a big precision loss.
* */
ndnboost::mpl::if_c<
#if (defined(BOOST_HAS_LONG_LONG) || defined(BOOST_HAS_MS_INT64)) && !defined(BOOST_MATH_NO_LONG_DOUBLE_MATH_FUNCTIONS)
ndnboost::type_traits::ice_eq< sizeof(double), sizeof(long double) >::value,
#else
1,
#endif
int,
char
>::type tag = 0;
return float_types_converter_internal(output, tag);
}
bool operator>>(long double& output)
{
int tag = 0;
return float_types_converter_internal(output, tag);
}
// Generic istream-based algorithm.
// lcast_streambuf_for_target<InputStreamable>::value is true.
template<typename InputStreamable>
bool operator>>(InputStreamable& output) { return shr_using_base_class(output); }
};
}
namespace detail
{
template<typename T>
struct is_stdstring
{
BOOST_STATIC_CONSTANT(bool, value = false );
};
template<typename CharT, typename Traits, typename Alloc>
struct is_stdstring< std::basic_string<CharT, Traits, Alloc> >
{
BOOST_STATIC_CONSTANT(bool, value = true );
};
template<typename CharT, typename Traits, typename Alloc>
struct is_stdstring< ndnboost::container::basic_string<CharT, Traits, Alloc> >
{
BOOST_STATIC_CONSTANT(bool, value = true );
};
template<typename Target, typename Source>
struct is_arithmetic_and_not_xchars
{
BOOST_STATIC_CONSTANT(bool, value =
(
ndnboost::type_traits::ice_and<
ndnboost::is_arithmetic<Source>::value,
ndnboost::is_arithmetic<Target>::value,
ndnboost::type_traits::ice_not<
detail::is_char_or_wchar<Target>::value
>::value,
ndnboost::type_traits::ice_not<
detail::is_char_or_wchar<Source>::value
>::value
>::value
)
);
};
/*
* is_xchar_to_xchar<Target, Source>::value is true, when
* Target and Souce are the same char types, or when
* Target and Souce are char types of the same size.
*/
template<typename Target, typename Source>
struct is_xchar_to_xchar
{
BOOST_STATIC_CONSTANT(bool, value =
(
ndnboost::type_traits::ice_or<
ndnboost::type_traits::ice_and<
is_same<Source,Target>::value,
is_char_or_wchar<Target>::value
>::value,
ndnboost::type_traits::ice_and<
ndnboost::type_traits::ice_eq< sizeof(char),sizeof(Target)>::value,
ndnboost::type_traits::ice_eq< sizeof(char),sizeof(Source)>::value,
is_char_or_wchar<Target>::value,
is_char_or_wchar<Source>::value
>::value
>::value
)
);
};
template<typename Target, typename Source>
struct is_char_array_to_stdstring
{
BOOST_STATIC_CONSTANT(bool, value = false );
};
template<typename CharT, typename Traits, typename Alloc>
struct is_char_array_to_stdstring< std::basic_string<CharT, Traits, Alloc>, CharT* >
{
BOOST_STATIC_CONSTANT(bool, value = true );
};
template<typename CharT, typename Traits, typename Alloc>
struct is_char_array_to_stdstring< std::basic_string<CharT, Traits, Alloc>, const CharT* >
{
BOOST_STATIC_CONSTANT(bool, value = true );
};
template<typename CharT, typename Traits, typename Alloc>
struct is_char_array_to_stdstring< ndnboost::container::basic_string<CharT, Traits, Alloc>, CharT* >
{
BOOST_STATIC_CONSTANT(bool, value = true );
};
template<typename CharT, typename Traits, typename Alloc>
struct is_char_array_to_stdstring< ndnboost::container::basic_string<CharT, Traits, Alloc>, const CharT* >
{
BOOST_STATIC_CONSTANT(bool, value = true );
};
#if (defined _MSC_VER)
# pragma warning( push )
# pragma warning( disable : 4701 ) // possible use of ... before initialization
# pragma warning( disable : 4702 ) // unreachable code
# pragma warning( disable : 4267 ) // conversion from 'size_t' to 'unsigned int'
#endif
template<typename Target, typename Source>
struct lexical_cast_do_cast
{
static inline Target lexical_cast_impl(const Source& arg)
{
typedef lexical_cast_stream_traits<Source, Target> stream_trait;
typedef detail::lexical_stream_limited_src<
BOOST_DEDUCED_TYPENAME stream_trait::char_type,
BOOST_DEDUCED_TYPENAME stream_trait::traits,
stream_trait::requires_stringbuf
> interpreter_type;
// Target type must be default constructible
Target result;
BOOST_DEDUCED_TYPENAME stream_trait::char_type buf[stream_trait::len_t::value + 1];
stream_trait::len_t::check_coverage();
interpreter_type interpreter(buf, buf + stream_trait::len_t::value + 1);
// Disabling ADL, by directly specifying operators.
if(!(interpreter.operator <<(arg) && interpreter.operator >>(result)))
BOOST_LCAST_THROW_BAD_CAST(Source, Target);
return result;
}
};
#if (defined _MSC_VER)
# pragma warning( pop )
#endif
template <typename Source>
struct lexical_cast_copy
{
static inline const Source& lexical_cast_impl(const Source &arg) BOOST_NOEXCEPT
{
return arg;
}
};
template <class Source, class Target >
struct detect_precision_loss
{
typedef ndnboost::numeric::Trunc<Source> Rounder;
typedef Source source_type ;
typedef BOOST_DEDUCED_TYPENAME mpl::if_<
ndnboost::is_arithmetic<Source>, Source, Source const&
>::type argument_type ;
static source_type nearbyint ( argument_type s )
{
const source_type near_int = Rounder::nearbyint(s);
if (near_int) {
const source_type orig_div_round = s / near_int;
const source_type eps = std::numeric_limits<source_type>::epsilon();
if ((orig_div_round > 1 ? orig_div_round - 1 : 1 - orig_div_round) > eps)
BOOST_LCAST_THROW_BAD_CAST(Source, Target);
}
return s ;
}
typedef typename Rounder::round_style round_style;
} ;
template <class Source, class Target >
struct nothrow_overflow_handler
{
void operator() ( ndnboost::numeric::range_check_result r )
{
if (r != ndnboost::numeric::cInRange)
BOOST_LCAST_THROW_BAD_CAST(Source, Target);
}
} ;
template <typename Target, typename Source>
struct lexical_cast_dynamic_num_not_ignoring_minus
{
static inline Target lexical_cast_impl(const Source &arg)
{
return ndnboost::numeric::converter<
Target,
Source,
ndnboost::numeric::conversion_traits<Target,Source>,
nothrow_overflow_handler<Source, Target>,
detect_precision_loss<Source, Target>
>::convert(arg);
}
};
template <typename Target, typename Source>
struct lexical_cast_dynamic_num_ignoring_minus
{
static inline Target lexical_cast_impl(const Source &arg)
{
typedef BOOST_DEDUCED_TYPENAME ndnboost::mpl::eval_if_c<
ndnboost::is_float<Source>::value,
ndnboost::mpl::identity<Source>,
ndnboost::make_unsigned<Source>
>::type usource_t;
typedef ndnboost::numeric::converter<
Target,
usource_t,
ndnboost::numeric::conversion_traits<Target,usource_t>,
nothrow_overflow_handler<usource_t, Target>,
detect_precision_loss<usource_t, Target>
> converter_t;
return (
arg < 0 ? static_cast<Target>(0u - converter_t::convert(0u - arg)) : converter_t::convert(arg)
);
}
};
/*
* lexical_cast_dynamic_num follows the rules:
* 1) If Source can be converted to Target without precision loss and
* without overflows, then assign Source to Target and return
*
* 2) If Source is less than 0 and Target is an unsigned integer,
* then negate Source, check the requirements of rule 1) and if
* successful, assign static_casted Source to Target and return
*
* 3) Otherwise throw a bad_lexical_cast exception
*
*
* Rule 2) required because ndnboost::lexical_cast has the behavior of
* stringstream, which uses the rules of scanf for conversions. And
* in the C99 standard for unsigned input value minus sign is
* optional, so if a negative number is read, no errors will arise
* and the result will be the two's complement.
*/
template <typename Target, typename Source>
struct lexical_cast_dynamic_num
{
static inline Target lexical_cast_impl(const Source &arg)
{
typedef BOOST_DEDUCED_TYPENAME ndnboost::mpl::if_c<
ndnboost::type_traits::ice_and<
ndnboost::type_traits::ice_or<
ndnboost::is_signed<Source>::value,
ndnboost::is_float<Source>::value
>::value,
ndnboost::type_traits::ice_not<
ndnboost::is_same<Source, bool>::value
>::value,
ndnboost::type_traits::ice_not<
ndnboost::is_same<Target, bool>::value
>::value,
ndnboost::is_unsigned<Target>::value
>::value,
lexical_cast_dynamic_num_ignoring_minus<Target, Source>,
lexical_cast_dynamic_num_not_ignoring_minus<Target, Source>
>::type caster_type;
return caster_type::lexical_cast_impl(arg);
}
};
}
template <typename Target, typename Source>
inline Target lexical_cast(const Source &arg)
{
typedef BOOST_DEDUCED_TYPENAME ndnboost::detail::array_to_pointer_decay<Source>::type src;
typedef BOOST_DEDUCED_TYPENAME ndnboost::type_traits::ice_or<
ndnboost::detail::is_xchar_to_xchar<Target, src >::value,
ndnboost::detail::is_char_array_to_stdstring<Target, src >::value,
ndnboost::type_traits::ice_and<
ndnboost::is_same<Target, src >::value,
ndnboost::detail::is_stdstring<Target >::value
>::value
> shall_we_copy_t;
typedef BOOST_DEDUCED_TYPENAME
ndnboost::detail::is_arithmetic_and_not_xchars<Target, src > shall_we_copy_with_dynamic_check_t;
typedef BOOST_DEDUCED_TYPENAME ndnboost::mpl::if_c<
shall_we_copy_t::value,
ndnboost::detail::lexical_cast_copy<src >,
BOOST_DEDUCED_TYPENAME ndnboost::mpl::if_c<
shall_we_copy_with_dynamic_check_t::value,
ndnboost::detail::lexical_cast_dynamic_num<Target, src >,
ndnboost::detail::lexical_cast_do_cast<Target, src >
>::type
>::type caster_type;
return caster_type::lexical_cast_impl(arg);
}
template <typename Target>
inline Target lexical_cast(const char* chars, std::size_t count)
{
return ::ndnboost::lexical_cast<Target>(
::ndnboost::iterator_range<const char*>(chars, chars + count)
);
}
template <typename Target>
inline Target lexical_cast(const unsigned char* chars, std::size_t count)
{
return ::ndnboost::lexical_cast<Target>(
::ndnboost::iterator_range<const unsigned char*>(chars, chars + count)
);
}
template <typename Target>
inline Target lexical_cast(const signed char* chars, std::size_t count)
{
return ::ndnboost::lexical_cast<Target>(
::ndnboost::iterator_range<const signed char*>(chars, chars + count)
);
}
#ifndef BOOST_LCAST_NO_WCHAR_T
template <typename Target>
inline Target lexical_cast(const wchar_t* chars, std::size_t count)
{
return ::ndnboost::lexical_cast<Target>(
::ndnboost::iterator_range<const wchar_t*>(chars, chars + count)
);
}
#endif
#ifndef BOOST_NO_CHAR16_T
template <typename Target>
inline Target lexical_cast(const char16_t* chars, std::size_t count)
{
return ::ndnboost::lexical_cast<Target>(
::ndnboost::iterator_range<const char16_t*>(chars, chars + count)
);
}
#endif
#ifndef BOOST_NO_CHAR32_T
template <typename Target>
inline Target lexical_cast(const char32_t* chars, std::size_t count)
{
return ::ndnboost::lexical_cast<Target>(
::ndnboost::iterator_range<const char32_t*>(chars, chars + count)
);
}
#endif
} // namespace ndnboost
#else // #ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
namespace ndnboost {
namespace detail
{
// selectors for choosing stream character type
template<typename Type>
struct stream_char
{
typedef char type;
};
#ifndef BOOST_LCAST_NO_WCHAR_T
#ifndef BOOST_NO_INTRINSIC_WCHAR_T
template<>
struct stream_char<wchar_t>
{
typedef wchar_t type;
};
#endif
template<>
struct stream_char<wchar_t *>
{
typedef wchar_t type;
};
template<>
struct stream_char<const wchar_t *>
{
typedef wchar_t type;
};
template<>
struct stream_char<std::wstring>
{
typedef wchar_t type;
};
#endif
// stream wrapper for handling lexical conversions
template<typename Target, typename Source, typename Traits>
class lexical_stream
{
private:
typedef typename widest_char<
typename stream_char<Target>::type,
typename stream_char<Source>::type>::type char_type;
typedef Traits traits_type;
public:
lexical_stream(char_type* = 0, char_type* = 0)
{
stream.unsetf(std::ios::skipws);
lcast_set_precision(stream, static_cast<Source*>(0), static_cast<Target*>(0) );
}
~lexical_stream()
{
#if defined(BOOST_NO_STRINGSTREAM)
stream.freeze(false);
#endif
}
bool operator<<(const Source &input)
{
return !(stream << input).fail();
}
template<typename InputStreamable>
bool operator>>(InputStreamable &output)
{
return !is_pointer<InputStreamable>::value &&
stream >> output &&
stream.get() ==
#if defined(__GNUC__) && (__GNUC__<3) && defined(BOOST_NO_STD_WSTRING)
// GCC 2.9x lacks std::char_traits<>::eof().
// We use BOOST_NO_STD_WSTRING to filter out STLport and libstdc++-v3
// configurations, which do provide std::char_traits<>::eof().
EOF;
#else
traits_type::eof();
#endif
}
bool operator>>(std::string &output)
{
#if defined(BOOST_NO_STRINGSTREAM)
stream << '\0';
#endif
stream.str().swap(output);
return true;
}
#ifndef BOOST_LCAST_NO_WCHAR_T
bool operator>>(std::wstring &output)
{
stream.str().swap(output);
return true;
}
#endif
private:
#if defined(BOOST_NO_STRINGSTREAM)
std::strstream stream;
#elif defined(BOOST_NO_STD_LOCALE)
std::stringstream stream;
#else
std::basic_stringstream<char_type,traits_type> stream;
#endif
};
}
// call-by-value fallback version (deprecated)
template<typename Target, typename Source>
Target lexical_cast(Source arg)
{
typedef typename detail::widest_char<
BOOST_DEDUCED_TYPENAME detail::stream_char<Target>::type
, BOOST_DEDUCED_TYPENAME detail::stream_char<Source>::type
>::type char_type;
typedef std::char_traits<char_type> traits;
detail::lexical_stream<Target, Source, traits> interpreter;
Target result;
if(!(interpreter << arg && interpreter >> result))
BOOST_LCAST_THROW_BAD_CAST(Source, Target);
return result;
}
} // namespace ndnboost
#endif
// Copyright Kevlin Henney, 2000-2005.
// Copyright Alexander Nasonov, 2006-2010.
// Copyright Antony Polukhin, 2011-2013.
//
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
#undef BOOST_LCAST_THROW_BAD_CAST
#undef BOOST_LCAST_NO_WCHAR_T
#undef BOOST_LCAST_HAS_INT128
#endif // BOOST_LEXICAL_CAST_INCLUDED