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00048 #ifndef STLSOFT_INCL_STLSOFT_UTIL_HPP_NULL
00049 #define STLSOFT_INCL_STLSOFT_UTIL_HPP_NULL
00050
00051 #ifndef STLSOFT_DOCUMENTATION_SKIP_SECTION
00052 # define STLSOFT_VER_STLSOFT_UTIL_HPP_NULL_MAJOR 4
00053 # define STLSOFT_VER_STLSOFT_UTIL_HPP_NULL_MINOR 0
00054 # define STLSOFT_VER_STLSOFT_UTIL_HPP_NULL_REVISION 1
00055 # define STLSOFT_VER_STLSOFT_UTIL_HPP_NULL_EDIT 50
00056 #endif
00057
00058
00059
00060
00061
00062 #ifndef STLSOFT_INCL_STLSOFT_H_STLSOFT
00063 # include <stlsoft/stlsoft.h>
00064 #endif
00065
00066
00067
00068 #ifdef _STLSOFT_NULL_v_DEFINED
00069 # undef _STLSOFT_NULL_v_DEFINED
00070 #endif
00071
00072 #define _STLSOFT_NULL_v_DEFINED
00073
00074 #if defined(STLSOFT_COMPILER_IS_DMC) && \
00075 __DMC__ < 0x0840
00076 # undef _STLSOFT_NULL_v_DEFINED
00077 #elif defined(STLSOFT_COMPILER_IS_MSVC) && \
00078 _MSC_VER < 1310
00079 # undef _STLSOFT_NULL_v_DEFINED
00080 #elif defined(STLSOFT_COMPILER_IS_WATCOM)
00081 # undef _STLSOFT_NULL_v_DEFINED
00082 #endif
00083
00084
00085
00086 #ifdef _STLSOFT_NULL_v_DEFINED_PTR_TO_MEMBER_SUPPORT
00087 # undef _STLSOFT_NULL_v_DEFINED_PTR_TO_MEMBER_SUPPORT
00088 #endif
00089
00090 #define _STLSOFT_NULL_v_DEFINED_PTR_TO_MEMBER_SUPPORT
00091
00092 #if defined(STLSOFT_COMPILER_IS_GCC)
00093 # undef _STLSOFT_NULL_v_DEFINED_PTR_TO_MEMBER_SUPPORT
00094 #elif defined(STLSOFT_COMPILER_IS_MWERKS)
00095 # undef _STLSOFT_NULL_v_DEFINED_PTR_TO_MEMBER_SUPPORT
00096 #endif
00097
00098
00099
00100
00101
00102 #ifndef _STLSOFT_NO_NAMESPACE
00103 namespace stlsoft
00104 {
00105 #endif
00106
00107
00108
00109
00110
00111 #ifdef _STLSOFT_NULL_v_DEFINED
00112
00134 struct NULL_v
00135 {
00136
00137 public:
00139 NULL_v()
00140 {}
00141
00146 public:
00147 static NULL_v create()
00148 {
00149 return NULL_v();
00150 }
00151
00152
00153 public:
00155 template <ss_typename_param_k T>
00156 operator T *() const
00157 {
00158 return 0;
00159 }
00160
00161 #ifdef _STLSOFT_NULL_v_DEFINED_PTR_TO_MEMBER_SUPPORT
00163 template< ss_typename_param_k T2
00164 , ss_typename_param_k C
00165 >
00166 operator T2 C::*() const
00167 {
00168 return 0;
00169 }
00170 #endif
00171
00175 template <ss_typename_param_k T>
00176 ss_bool_t equal(T const& rhs) const
00177 {
00178 return rhs == 0;
00179 }
00181 template <ss_typename_param_k T>
00182 ss_bool_t equals(T const& rhs) const
00183 {
00184 return equal(rhs);
00185 }
00186
00187
00188 private:
00189 void operator &() const;
00190
00191 #if !defined(STLSOFT_COMPILER_IS_GCC)
00192 NULL_v(NULL_v const&);
00193 NULL_v const& operator =(NULL_v const&);
00194 #endif
00195 };
00196
00197 #if 0
00198
00202 template <ss_typename_param_k T>
00203 inline ss_bool_t operator ==(NULL_v const& lhs, T const& rhs)
00204 {
00205 STLSOFT_STATIC_ASSERT(sizeof(rhs) == 4);
00206
00207 return lhs.equal(rhs);
00208 }
00209
00214 template <ss_typename_param_k T>
00215 inline ss_bool_t operator ==(T const& lhs, NULL_v const& rhs)
00216 {
00217 STLSOFT_STATIC_ASSERT(sizeof(lhs) == 4);
00218
00219 return rhs.equal(lhs);
00220 }
00221
00226 template <ss_typename_param_k T>
00227 inline ss_bool_t operator !=(NULL_v const& lhs, T const& rhs)
00228 {
00229 STLSOFT_STATIC_ASSERT(sizeof(rhs) == 4);
00230
00231 return !lhs.equal(rhs);
00232 }
00233
00238 template <ss_typename_param_k T>
00239 inline ss_bool_t operator !=(T const& lhs, NULL_v const& rhs)
00240 {
00241 STLSOFT_STATIC_ASSERT(sizeof(lhs) == 4);
00242
00243 return !rhs.equal(lhs);
00244 }
00245 #endif
00246
00247 #endif
00248
00250
00251
00252 #ifdef STLSOFT_UNITTEST
00253 # include "./unittest/null_unittest_.h"
00254 #endif
00255
00256
00257
00258 #ifndef _STLSOFT_NO_NAMESPACE
00259 }
00260 #endif
00261
00262
00263
00264 #endif
00265
00266