Jeff Thompson | f7d4994 | 2013-08-01 16:47:40 -0700 | [diff] [blame] | 1 | #ifndef BOOST_TT_IS_ABSTRACT_CLASS_HPP |
| 2 | #define BOOST_TT_IS_ABSTRACT_CLASS_HPP |
| 3 | |
| 4 | #if defined(_MSC_VER) && (_MSC_VER >= 1020) |
| 5 | # pragma once |
| 6 | #endif |
| 7 | |
| 8 | /////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8 |
| 9 | // is_abstract_class.hpp: |
| 10 | // |
| 11 | // (C) Copyright 2002 Rani Sharoni (rani_sharoni@hotmail.com) and Robert Ramey |
| 12 | // Use, modification and distribution is subject to the Boost Software |
| 13 | // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at |
| 14 | // http://www.boost.org/LICENSE_1_0.txt) |
| 15 | // |
| 16 | // See http://www.boost.org for updates, documentation, and revision history. |
| 17 | // |
| 18 | |
| 19 | // Compile type discovery whether given type is abstract class or not. |
| 20 | // |
| 21 | // Requires DR 337 to be supported by compiler |
| 22 | // (http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/cwg_active.html#337). |
| 23 | // |
| 24 | // |
| 25 | // Believed (Jan 2004) to work on: |
| 26 | // - GCC 3.4 |
| 27 | // - VC++ 7.1 |
| 28 | // - compilers with new EDG frontend (Intel C++ 7, Comeau 4.3.2) |
| 29 | // |
| 30 | // Doesn't work on: |
| 31 | // - VC++6, VC++7.0 and less |
| 32 | // - GCC 3.3.X and less |
| 33 | // - Borland C++ 6 and less |
| 34 | // |
| 35 | // |
| 36 | // History: |
| 37 | // - Originally written by Rani Sharoni, see |
| 38 | // http://groups.google.com/groups?selm=df893da6.0207110613.75b2fe90%40posting.google.com |
| 39 | // At this time supported by EDG (Intel C++ 7, Comeau 4.3.2) and VC7.1. |
| 40 | // - Adapted and added into Boost.Serialization library by Robert Ramey |
| 41 | // (starting with submission #10). |
| 42 | // - Jan 2004: GCC 3.4 fixed to support DR337 (Giovanni Bajo). |
| 43 | // - Jan 2004: modified to be part of Boost.TypeTraits (Pavel Vozenilek). |
| 44 | // - Nov 2004: Christoph Ludwig found that the implementation did not work with |
| 45 | // template types and gcc-3.4 or VC7.1, fix due to Christoph Ludwig |
| 46 | // and John Maddock. |
| 47 | // - Dec 2004: Added new config macro BOOST_NO_IS_ABSTRACT which causes the template |
| 48 | // to degrade gracefully, rather than trash the compiler (John Maddock). |
| 49 | // |
| 50 | |
Jeff Thompson | 2277ce5 | 2013-08-01 17:34:11 -0700 | [diff] [blame] | 51 | #include <ndnboost/type_traits/intrinsics.hpp> |
Jeff Thompson | f7d4994 | 2013-08-01 16:47:40 -0700 | [diff] [blame] | 52 | #ifndef BOOST_IS_ABSTRACT |
Jeff Thompson | 2277ce5 | 2013-08-01 17:34:11 -0700 | [diff] [blame] | 53 | #include <ndnboost/static_assert.hpp> |
| 54 | #include <ndnboost/type_traits/detail/yes_no_type.hpp> |
| 55 | #include <ndnboost/type_traits/is_class.hpp> |
| 56 | #include <ndnboost/type_traits/detail/ice_and.hpp> |
Jeff Thompson | f7d4994 | 2013-08-01 16:47:40 -0700 | [diff] [blame] | 57 | #ifdef BOOST_NO_IS_ABSTRACT |
Jeff Thompson | 2277ce5 | 2013-08-01 17:34:11 -0700 | [diff] [blame] | 58 | #include <ndnboost/type_traits/is_polymorphic.hpp> |
Jeff Thompson | f7d4994 | 2013-08-01 16:47:40 -0700 | [diff] [blame] | 59 | #endif |
| 60 | #endif |
| 61 | // should be the last #include |
Jeff Thompson | 2277ce5 | 2013-08-01 17:34:11 -0700 | [diff] [blame] | 62 | #include <ndnboost/type_traits/detail/bool_trait_def.hpp> |
Jeff Thompson | f7d4994 | 2013-08-01 16:47:40 -0700 | [diff] [blame] | 63 | |
| 64 | |
| 65 | namespace ndnboost { |
| 66 | namespace detail{ |
| 67 | |
| 68 | #ifdef BOOST_IS_ABSTRACT |
| 69 | template <class T> |
| 70 | struct is_abstract_imp |
| 71 | { |
| 72 | BOOST_STATIC_CONSTANT(bool, value = BOOST_IS_ABSTRACT(T)); |
| 73 | }; |
| 74 | #elif !defined(BOOST_NO_IS_ABSTRACT) |
| 75 | template<class T> |
| 76 | struct is_abstract_imp2 |
| 77 | { |
| 78 | // Deduction fails if T is void, function type, |
| 79 | // reference type (14.8.2/2)or an abstract class type |
| 80 | // according to review status issue #337 |
| 81 | // |
| 82 | template<class U> |
| 83 | static type_traits::no_type check_sig(U (*)[1]); |
| 84 | template<class U> |
| 85 | static type_traits::yes_type check_sig(...); |
| 86 | // |
| 87 | // T must be a complete type, further if T is a template then |
| 88 | // it must be instantiated in order for us to get the right answer: |
| 89 | // |
| 90 | BOOST_STATIC_ASSERT(sizeof(T) != 0); |
| 91 | |
| 92 | // GCC2 won't even parse this template if we embed the computation |
| 93 | // of s1 in the computation of value. |
| 94 | #ifdef __GNUC__ |
| 95 | BOOST_STATIC_CONSTANT(std::size_t, s1 = sizeof(is_abstract_imp2<T>::template check_sig<T>(0))); |
| 96 | #else |
| 97 | #if BOOST_WORKAROUND(BOOST_MSVC_FULL_VER, >= 140050000) |
| 98 | #pragma warning(push) |
| 99 | #pragma warning(disable:6334) |
| 100 | #endif |
| 101 | BOOST_STATIC_CONSTANT(std::size_t, s1 = sizeof(check_sig<T>(0))); |
| 102 | #if BOOST_WORKAROUND(BOOST_MSVC_FULL_VER, >= 140050000) |
| 103 | #pragma warning(pop) |
| 104 | #endif |
| 105 | #endif |
| 106 | |
| 107 | BOOST_STATIC_CONSTANT(bool, value = |
| 108 | (s1 == sizeof(type_traits::yes_type))); |
| 109 | }; |
| 110 | |
| 111 | template <bool v> |
| 112 | struct is_abstract_select |
| 113 | { |
| 114 | template <class T> |
| 115 | struct rebind |
| 116 | { |
| 117 | typedef is_abstract_imp2<T> type; |
| 118 | }; |
| 119 | }; |
| 120 | template <> |
| 121 | struct is_abstract_select<false> |
| 122 | { |
| 123 | template <class T> |
| 124 | struct rebind |
| 125 | { |
| 126 | typedef false_type type; |
| 127 | }; |
| 128 | }; |
| 129 | |
| 130 | template <class T> |
| 131 | struct is_abstract_imp |
| 132 | { |
| 133 | typedef is_abstract_select< ::ndnboost::is_class<T>::value> selector; |
| 134 | typedef typename selector::template rebind<T> binder; |
| 135 | typedef typename binder::type type; |
| 136 | |
| 137 | BOOST_STATIC_CONSTANT(bool, value = type::value); |
| 138 | }; |
| 139 | |
| 140 | #endif |
| 141 | } |
| 142 | |
| 143 | #ifndef BOOST_NO_IS_ABSTRACT |
| 144 | BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_abstract,T,::ndnboost::detail::is_abstract_imp<T>::value) |
| 145 | #else |
| 146 | BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_abstract,T,::ndnboost::detail::is_polymorphic_imp<T>::value) |
| 147 | #endif |
| 148 | |
| 149 | } // namespace ndnboost |
| 150 | |
Jeff Thompson | 2277ce5 | 2013-08-01 17:34:11 -0700 | [diff] [blame] | 151 | #include <ndnboost/type_traits/detail/bool_trait_undef.hpp> |
Jeff Thompson | f7d4994 | 2013-08-01 16:47:40 -0700 | [diff] [blame] | 152 | |
| 153 | #endif //BOOST_TT_IS_ABSTRACT_CLASS_HPP |