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: 54633 $ 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 <boost/test/utils/runtime/config.hpp> 24 #include <boost/test/utils/runtime/fwd.hpp> 25 #include <boost/test/utils/runtime/parameter.hpp> 26 #include <boost/test/utils/runtime/argument.hpp> 27 28 #include <boost/test/utils/runtime/env/fwd.hpp> 29 30 // Boost 31 #include <boost/optional.hpp> 32 33 namespace boost { 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( boost::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; } 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( boost::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 boost 185 186 // ************************************************************************** // 187 // ************************************************************************** // 188 // Implementation 189 190 #include <boost/test/utils/runtime/env/environment.hpp> 191 192 // ************************************************************************** // 193 // ************** runtime::environment::variable ************** // 194 // ************************************************************************** // 195 196 namespace boost { 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 boost 222 223 #endif // BOOST_RT_ENV_VARIABLE_HPP_062604GER 224
