functional

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00001 // Functional extensions -*- C++ -*- 00002 00003 // Copyright (C) 2002 Free Software Foundation, Inc. 00004 // 00005 // This file is part of the GNU ISO C++ Library. This library is free 00006 // software; you can redistribute it and/or modify it under the 00007 // terms of the GNU General Public License as published by the 00008 // Free Software Foundation; either version 2, or (at your option) 00009 // any later version. 00010 00011 // This library is distributed in the hope that it will be useful, 00012 // but WITHOUT ANY WARRANTY; without even the implied warranty of 00013 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00014 // GNU General Public License for more details. 00015 00016 // You should have received a copy of the GNU General Public License along 00017 // with this library; see the file COPYING. If not, write to the Free 00018 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, 00019 // USA. 00020 00021 // As a special exception, you may use this file as part of a free software 00022 // library without restriction. Specifically, if other files instantiate 00023 // templates or use macros or inline functions from this file, or you compile 00024 // this file and link it with other files to produce an executable, this 00025 // file does not by itself cause the resulting executable to be covered by 00026 // the GNU General Public License. This exception does not however 00027 // invalidate any other reasons why the executable file might be covered by 00028 // the GNU General Public License. 00029 00030 /* 00031 * 00032 * Copyright (c) 1994 00033 * Hewlett-Packard Company 00034 * 00035 * Permission to use, copy, modify, distribute and sell this software 00036 * and its documentation for any purpose is hereby granted without fee, 00037 * provided that the above copyright notice appear in all copies and 00038 * that both that copyright notice and this permission notice appear 00039 * in supporting documentation. Hewlett-Packard Company makes no 00040 * representations about the suitability of this software for any 00041 * purpose. It is provided "as is" without express or implied warranty. 00042 * 00043 * 00044 * Copyright (c) 1996 00045 * Silicon Graphics Computer Systems, Inc. 00046 * 00047 * Permission to use, copy, modify, distribute and sell this software 00048 * and its documentation for any purpose is hereby granted without fee, 00049 * provided that the above copyright notice appear in all copies and 00050 * that both that copyright notice and this permission notice appear 00051 * in supporting documentation. Silicon Graphics makes no 00052 * representations about the suitability of this software for any 00053 * purpose. It is provided "as is" without express or implied warranty. 00054 */ 00055 00062 #ifndef _EXT_FUNCTIONAL 00063 #define _EXT_FUNCTIONAL 00064 00065 #pragma GCC system_header 00066 #include <functional> 00067 00068 namespace __gnu_cxx 00069 { 00070 using std::unary_function; 00071 using std::binary_function; 00072 using std::mem_fun1_t; 00073 using std::const_mem_fun1_t; 00074 using std::mem_fun1_ref_t; 00075 using std::const_mem_fun1_ref_t; 00076 00086 00087 template <class _Tp> inline _Tp identity_element(std::plus<_Tp>) { 00088 return _Tp(0); 00089 } 00091 template <class _Tp> inline _Tp identity_element(std::multiplies<_Tp>) { 00092 return _Tp(1); 00093 } 00122 00123 template <class _Operation1, class _Operation2> 00124 class unary_compose 00125 : public unary_function<typename _Operation2::argument_type, 00126 typename _Operation1::result_type> 00127 { 00128 protected: 00129 _Operation1 _M_fn1; 00130 _Operation2 _M_fn2; 00131 public: 00132 unary_compose(const _Operation1& __x, const _Operation2& __y) 00133 : _M_fn1(__x), _M_fn2(__y) {} 00134 typename _Operation1::result_type 00135 operator()(const typename _Operation2::argument_type& __x) const { 00136 return _M_fn1(_M_fn2(__x)); 00137 } 00138 }; 00139 00141 template <class _Operation1, class _Operation2> 00142 inline unary_compose<_Operation1,_Operation2> 00143 compose1(const _Operation1& __fn1, const _Operation2& __fn2) 00144 { 00145 return unary_compose<_Operation1,_Operation2>(__fn1, __fn2); 00146 } 00147 00149 template <class _Operation1, class _Operation2, class _Operation3> 00150 class binary_compose 00151 : public unary_function<typename _Operation2::argument_type, 00152 typename _Operation1::result_type> { 00153 protected: 00154 _Operation1 _M_fn1; 00155 _Operation2 _M_fn2; 00156 _Operation3 _M_fn3; 00157 public: 00158 binary_compose(const _Operation1& __x, const _Operation2& __y, 00159 const _Operation3& __z) 00160 : _M_fn1(__x), _M_fn2(__y), _M_fn3(__z) { } 00161 typename _Operation1::result_type 00162 operator()(const typename _Operation2::argument_type& __x) const { 00163 return _M_fn1(_M_fn2(__x), _M_fn3(__x)); 00164 } 00165 }; 00166 00168 template <class _Operation1, class _Operation2, class _Operation3> 00169 inline binary_compose<_Operation1, _Operation2, _Operation3> 00170 compose2(const _Operation1& __fn1, const _Operation2& __fn2, 00171 const _Operation3& __fn3) 00172 { 00173 return binary_compose<_Operation1,_Operation2,_Operation3> 00174 (__fn1, __fn2, __fn3); 00175 } 00184 template <class _Tp> struct identity : public std::_Identity<_Tp> {}; 00185 00196 00197 template <class _Pair> struct select1st : public std::_Select1st<_Pair> {}; 00199 template <class _Pair> struct select2nd : public std::_Select2nd<_Pair> {}; 00202 // extension documented next 00203 template <class _Arg1, class _Arg2> 00204 struct _Project1st : public binary_function<_Arg1, _Arg2, _Arg1> { 00205 _Arg1 operator()(const _Arg1& __x, const _Arg2&) const { return __x; } 00206 }; 00207 00208 template <class _Arg1, class _Arg2> 00209 struct _Project2nd : public binary_function<_Arg1, _Arg2, _Arg2> { 00210 _Arg2 operator()(const _Arg1&, const _Arg2& __y) const { return __y; } 00211 }; 00212 00221 00222 template <class _Arg1, class _Arg2> 00223 struct project1st : public _Project1st<_Arg1, _Arg2> {}; 00224 00226 template <class _Arg1, class _Arg2> 00227 struct project2nd : public _Project2nd<_Arg1, _Arg2> {}; 00230 // extension documented next 00231 template <class _Result> 00232 struct _Constant_void_fun { 00233 typedef _Result result_type; 00234 result_type _M_val; 00235 00236 _Constant_void_fun(const result_type& __v) : _M_val(__v) {} 00237 const result_type& operator()() const { return _M_val; } 00238 }; 00239 00240 template <class _Result, class _Argument> 00241 struct _Constant_unary_fun { 00242 typedef _Argument argument_type; 00243 typedef _Result result_type; 00244 result_type _M_val; 00245 00246 _Constant_unary_fun(const result_type& __v) : _M_val(__v) {} 00247 const result_type& operator()(const _Argument&) const { return _M_val; } 00248 }; 00249 00250 template <class _Result, class _Arg1, class _Arg2> 00251 struct _Constant_binary_fun { 00252 typedef _Arg1 first_argument_type; 00253 typedef _Arg2 second_argument_type; 00254 typedef _Result result_type; 00255 _Result _M_val; 00256 00257 _Constant_binary_fun(const _Result& __v) : _M_val(__v) {} 00258 const result_type& operator()(const _Arg1&, const _Arg2&) const { 00259 return _M_val; 00260 } 00261 }; 00262 00277 00278 template <class _Result> 00279 struct constant_void_fun : public _Constant_void_fun<_Result> { 00280 constant_void_fun(const _Result& __v) : _Constant_void_fun<_Result>(__v) {} 00281 }; 00282 00284 template <class _Result, 00285 class _Argument = _Result> 00286 struct constant_unary_fun : public _Constant_unary_fun<_Result, _Argument> 00287 { 00288 constant_unary_fun(const _Result& __v) 00289 : _Constant_unary_fun<_Result, _Argument>(__v) {} 00290 }; 00291 00293 template <class _Result, 00294 class _Arg1 = _Result, 00295 class _Arg2 = _Arg1> 00296 struct constant_binary_fun 00297 : public _Constant_binary_fun<_Result, _Arg1, _Arg2> 00298 { 00299 constant_binary_fun(const _Result& __v) 00300 : _Constant_binary_fun<_Result, _Arg1, _Arg2>(__v) {} 00301 }; 00302 00304 template <class _Result> 00305 inline constant_void_fun<_Result> constant0(const _Result& __val) 00306 { 00307 return constant_void_fun<_Result>(__val); 00308 } 00309 00311 template <class _Result> 00312 inline constant_unary_fun<_Result,_Result> constant1(const _Result& __val) 00313 { 00314 return constant_unary_fun<_Result,_Result>(__val); 00315 } 00316 00318 template <class _Result> 00319 inline constant_binary_fun<_Result,_Result,_Result> 00320 constant2(const _Result& __val) 00321 { 00322 return constant_binary_fun<_Result,_Result,_Result>(__val); 00323 } 00332 class subtractive_rng : public unary_function<unsigned int, unsigned int> { 00333 private: 00334 unsigned int _M_table[55]; 00335 size_t _M_index1; 00336 size_t _M_index2; 00337 public: 00339 unsigned int operator()(unsigned int __limit) { 00340 _M_index1 = (_M_index1 + 1) % 55; 00341 _M_index2 = (_M_index2 + 1) % 55; 00342 _M_table[_M_index1] = _M_table[_M_index1] - _M_table[_M_index2]; 00343 return _M_table[_M_index1] % __limit; 00344 } 00345 00346 void _M_initialize(unsigned int __seed) 00347 { 00348 unsigned int __k = 1; 00349 _M_table[54] = __seed; 00350 size_t __i; 00351 for (__i = 0; __i < 54; __i++) { 00352 size_t __ii = (21 * (__i + 1) % 55) - 1; 00353 _M_table[__ii] = __k; 00354 __k = __seed - __k; 00355 __seed = _M_table[__ii]; 00356 } 00357 for (int __loop = 0; __loop < 4; __loop++) { 00358 for (__i = 0; __i < 55; __i++) 00359 _M_table[__i] = _M_table[__i] - _M_table[(1 + __i + 30) % 55]; 00360 } 00361 _M_index1 = 0; 00362 _M_index2 = 31; 00363 } 00364 00366 subtractive_rng(unsigned int __seed) { _M_initialize(__seed); } 00368 subtractive_rng() { _M_initialize(161803398u); } 00369 }; 00370 00371 // Mem_fun adaptor helper functions mem_fun1 and mem_fun1_ref, 00372 // provided for backward compatibility, they are no longer part of 00373 // the C++ standard. 00374 00375 template <class _Ret, class _Tp, class _Arg> 00376 inline mem_fun1_t<_Ret,_Tp,_Arg> mem_fun1(_Ret (_Tp::*__f)(_Arg)) 00377 { return mem_fun1_t<_Ret,_Tp,_Arg>(__f); } 00378 00379 template <class _Ret, class _Tp, class _Arg> 00380 inline const_mem_fun1_t<_Ret,_Tp,_Arg> mem_fun1(_Ret (_Tp::*__f)(_Arg) const) 00381 { return const_mem_fun1_t<_Ret,_Tp,_Arg>(__f); } 00382 00383 template <class _Ret, class _Tp, class _Arg> 00384 inline mem_fun1_ref_t<_Ret,_Tp,_Arg> mem_fun1_ref(_Ret (_Tp::*__f)(_Arg)) 00385 { return mem_fun1_ref_t<_Ret,_Tp,_Arg>(__f); } 00386 00387 template <class _Ret, class _Tp, class _Arg> 00388 inline const_mem_fun1_ref_t<_Ret,_Tp,_Arg> 00389 mem_fun1_ref(_Ret (_Tp::*__f)(_Arg) const) 00390 { return const_mem_fun1_ref_t<_Ret,_Tp,_Arg>(__f); } 00391 00392 } // namespace __gnu_cxx 00393 00394 #endif /* _EXT_FUNCTIONAL */ 00395

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