Jeff Thompson | ef2d5a4 | 2013-08-22 19:09:24 -0700 | [diff] [blame] | 1 | // (C) Copyright Gennadiy Rozental 2005-2008. |
| 2 | // Distributed under the Boost Software License, Version 1.0. |
| 3 | // (See accompanying file LICENSE_1_0.txt or copy at |
| 4 | // http://www.boost.org/LICENSE_1_0.txt) |
| 5 | |
| 6 | // See http://www.boost.org/libs/test for the library home page. |
| 7 | // |
| 8 | // File : $RCSfile$ |
| 9 | // |
| 10 | // Version : $Revision: 81913 $ |
| 11 | // |
| 12 | // Description : defines model of program environment variable |
| 13 | // *************************************************************************** |
| 14 | |
| 15 | #ifndef BOOST_RT_ENV_VARIABLE_HPP_062604GER |
| 16 | #define BOOST_RT_ENV_VARIABLE_HPP_062604GER |
| 17 | |
| 18 | #ifdef UNDER_CE |
| 19 | #error Windows CE does not support environment variables. |
| 20 | #endif |
| 21 | |
| 22 | // Boost.Runtime.Parameter |
| 23 | #include <ndnboost/test/utils/runtime/config.hpp> |
| 24 | #include <ndnboost/test/utils/runtime/fwd.hpp> |
| 25 | #include <ndnboost/test/utils/runtime/parameter.hpp> |
| 26 | #include <ndnboost/test/utils/runtime/argument.hpp> |
| 27 | |
| 28 | #include <ndnboost/test/utils/runtime/env/fwd.hpp> |
| 29 | |
| 30 | // Boost |
| 31 | #include <ndnboost/optional.hpp> |
| 32 | |
| 33 | namespace ndnboost { |
| 34 | |
| 35 | namespace BOOST_RT_PARAM_NAMESPACE { |
| 36 | |
| 37 | namespace environment { |
| 38 | |
| 39 | // ************************************************************************** // |
| 40 | // ************** runtime::environment::variable_data ************** // |
| 41 | // ************************************************************************** // |
| 42 | |
| 43 | namespace rt_env_detail { |
| 44 | |
| 45 | struct variable_data : public runtime::parameter { |
| 46 | cstring m_var_name; |
| 47 | dstring m_global_id; |
| 48 | argument_ptr m_value; |
| 49 | }; |
| 50 | |
| 51 | } // namespace rt_env_detail |
| 52 | |
| 53 | // ************************************************************************** // |
| 54 | // ************** runtime::environment::variable_base ************** // |
| 55 | // ************************************************************************** // |
| 56 | |
| 57 | class variable_base { |
| 58 | public: |
| 59 | explicit variable_base( rt_env_detail::variable_data& data ) : m_data( &data ) {} |
| 60 | |
| 61 | // arguments access |
| 62 | template<typename T> |
| 63 | T const& value() const |
| 64 | { |
| 65 | return arg_value<T>( *m_data->m_value ); |
| 66 | } |
| 67 | |
| 68 | template<typename T> |
| 69 | void value( ndnboost::optional<T>& res ) const |
| 70 | { |
| 71 | if( has_value() ) |
| 72 | res = arg_value<T>( *m_data->m_value ); |
| 73 | else |
| 74 | res.reset(); |
| 75 | } |
| 76 | |
| 77 | bool has_value() const { return m_data->m_value!=0; } |
| 78 | cstring name() const { return m_data->m_var_name; } |
| 79 | |
| 80 | protected: |
| 81 | // Data members |
| 82 | rt_env_detail::variable_data* m_data; |
| 83 | } ; |
| 84 | |
| 85 | // ************************************************************************** // |
| 86 | // ************** runtime::environment::variable ************** // |
| 87 | // ************************************************************************** // |
| 88 | |
| 89 | template<typename T = cstring> |
| 90 | class variable : public variable_base { |
| 91 | public: |
| 92 | // Constructors |
| 93 | explicit variable( cstring var_name ); |
| 94 | |
| 95 | template<typename Modifiers> |
| 96 | explicit variable( cstring var_name, Modifiers const& m ); |
| 97 | |
| 98 | explicit variable( rt_env_detail::variable_data& data ) |
| 99 | : variable_base( data ) {} |
| 100 | |
| 101 | // other variable assignment |
| 102 | void operator=( variable const& v ) { m_data = v.m_data; } |
| 103 | |
| 104 | // access methods |
| 105 | T const& value() const { return variable_base::value<T>(); } |
| 106 | |
| 107 | #if BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3206)) || \ |
| 108 | BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x0593)) |
| 109 | template<typename T> |
| 110 | void value( ndnboost::optional<T>& res ) const { variable_base::value( res ); } |
| 111 | #else |
| 112 | using variable_base::value; |
| 113 | #endif |
| 114 | |
| 115 | // Value assignment |
| 116 | template<typename V> |
| 117 | void operator=( V const& v ) |
| 118 | { |
| 119 | if( !has_value() ) |
| 120 | m_data->m_value.reset( new typed_argument<T>( *m_data ) ); |
| 121 | |
| 122 | arg_value<T>( *m_data->m_value ) = v; |
| 123 | |
| 124 | rt_env_detail::sys_write_var( m_data->m_var_name, format_stream().ref() << value() ); |
| 125 | } |
| 126 | }; // class variable |
| 127 | |
| 128 | //____________________________________________________________________________// |
| 129 | |
| 130 | template<typename CharT, typename Tr,typename T> |
| 131 | inline std::basic_ostream<CharT,Tr>& |
| 132 | operator<<( std::basic_ostream<CharT,Tr>& os, variable<T> const& v ) |
| 133 | { |
| 134 | os << v.name() << '='; |
| 135 | |
| 136 | if( v.has_value() ) |
| 137 | os << v.value(); |
| 138 | |
| 139 | return os; |
| 140 | } |
| 141 | |
| 142 | //____________________________________________________________________________// |
| 143 | |
| 144 | template<typename T, typename V> |
| 145 | inline bool |
| 146 | operator==( variable<T> ev, V const& v ) |
| 147 | { |
| 148 | return ev.has_value() && ev.value() == v; |
| 149 | } |
| 150 | |
| 151 | //____________________________________________________________________________// |
| 152 | |
| 153 | template<typename T, typename V> |
| 154 | inline bool |
| 155 | operator==( V const& v, variable<T> ev ) |
| 156 | { |
| 157 | return ev.has_value() && ev.value() == v; |
| 158 | } |
| 159 | |
| 160 | //____________________________________________________________________________// |
| 161 | |
| 162 | template<typename T, typename V> |
| 163 | inline bool |
| 164 | operator!=( variable<T> ev, V const& v ) |
| 165 | { |
| 166 | return !ev.has_value() || ev.value() != v; |
| 167 | } |
| 168 | |
| 169 | //____________________________________________________________________________// |
| 170 | |
| 171 | template<typename T, typename V> |
| 172 | inline bool |
| 173 | operator!=( V const& v, variable<T> ev ) |
| 174 | { |
| 175 | return !ev.has_value() || ev.value() != v; |
| 176 | } |
| 177 | |
| 178 | //____________________________________________________________________________// |
| 179 | |
| 180 | } // namespace environment |
| 181 | |
| 182 | } // namespace BOOST_RT_PARAM_NAMESPACE |
| 183 | |
| 184 | } // namespace ndnboost |
| 185 | |
| 186 | // ************************************************************************** // |
| 187 | // ************************************************************************** // |
| 188 | // Implementation |
| 189 | |
| 190 | #include <ndnboost/test/utils/runtime/env/environment.hpp> |
| 191 | |
| 192 | // ************************************************************************** // |
| 193 | // ************** runtime::environment::variable ************** // |
| 194 | // ************************************************************************** // |
| 195 | |
| 196 | namespace ndnboost { |
| 197 | |
| 198 | namespace BOOST_RT_PARAM_NAMESPACE { |
| 199 | |
| 200 | namespace environment { |
| 201 | |
| 202 | template<typename T> |
| 203 | variable<T>::variable( cstring var_name ) |
| 204 | : variable_base( environment::var<T>( var_name ) ) |
| 205 | {} |
| 206 | |
| 207 | //____________________________________________________________________________// |
| 208 | |
| 209 | template<typename T> |
| 210 | template<typename Modifiers> |
| 211 | variable<T>::variable( cstring var_name, Modifiers const& m ) |
| 212 | : variable_base( environment::var<T>( var_name, m ) ) |
| 213 | {} |
| 214 | |
| 215 | //____________________________________________________________________________// |
| 216 | |
| 217 | } // namespace environment |
| 218 | |
| 219 | } // namespace BOOST_RT_PARAM_NAMESPACE |
| 220 | |
| 221 | } // namespace ndnboost |
| 222 | |
| 223 | #endif // BOOST_RT_ENV_VARIABLE_HPP_062604GER |