1 // Concept-checking control -*- C++ -*- 2 3 // Copyright (C) 2001 Free Software Foundation, Inc. 4 // 5 // This file is part of the GNU ISO C++ Library. This library is free 6 // software; you can redistribute it and/or modify it under the 7 // terms of the GNU General Public License as published by the 8 // Free Software Foundation; either version 2, or (at your option) 9 // any later version. 10 11 // This library is distributed in the hope that it will be useful, 12 // but WITHOUT ANY WARRANTY; without even the implied warranty of 13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 // GNU General Public License for more details. 15 16 // You should have received a copy of the GNU General Public License along 17 // with this library; see the file COPYING. If not, write to the Free 18 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 19 // USA. 20 21 // As a special exception, you may use this file as part of a free software 22 // library without restriction. Specifically, if other files instantiate 23 // templates or use macros or inline functions from this file, or you compile 24 // this file and link it with other files to produce an executable, this 25 // file does not by itself cause the resulting executable to be covered by 26 // the GNU General Public License. This exception does not however 27 // invalidate any other reasons why the executable file might be covered by 28 // the GNU General Public License. 29 30 /** @file concept_check.h 31 * This is an internal header file, included by other library headers. 32 * You should not attempt to use it directly. 33 */ 34 35 #ifndef _CONCEPT_CHECK_H 36 #define _CONCEPT_CHECK_H 1 37 38 #pragma GCC system_header 39 40 #include <bits/c++config.h> 41 42 // All places in libstdc++-v3 where these are used, or /might/ be used, or 43 // don't need to be used, or perhaps /should/ be used, are commented with 44 // "concept requirements" (and maybe some more text). So grep like crazy 45 // if you're looking for additional places to use these. 46 47 // Concept-checking code is off by default unless users turn it on via 48 // configure options or editing c++config.h. 49 50 #ifndef _GLIBCXX_CONCEPT_CHECKS 51 52 #define __glibcxx_function_requires(...) 53 #define __glibcxx_class_requires(_a,_b) 54 #define __glibcxx_class_requires2(_a,_b,_c) 55 #define __glibcxx_class_requires3(_a,_b,_c,_d) 56 #define __glibcxx_class_requires4(_a,_b,_c,_d,_e) 57 58 #else // the checks are on 59 60 #include <bits/boost_concept_check.h> 61 62 // Note that the obvious and elegant approach of 63 // 64 //#define glibcxx_function_requires(C) boost::function_requires< boost::C >() 65 // 66 // won't work due to concept templates with more than one parameter, e.g., 67 // BinaryPredicateConcept. The preprocessor tries to split things up on 68 // the commas in the template argument list. We can't use an inner pair of 69 // parenthesis to hide the commas, because "boost::(Temp<Foo,Bar>)" isn't 70 // a valid instantiation pattern. Thus, we steal a feature from C99. 71 72 #define __glibcxx_function_requires(...) \ 73 __gnu_cxx::__function_requires< __gnu_cxx::__VA_ARGS__ >(); 74 #define __glibcxx_class_requires(_a,_C) \ 75 _GLIBCXX_CLASS_REQUIRES(_a, __gnu_cxx, _C); 76 #define __glibcxx_class_requires2(_a,_b,_C) \ 77 _GLIBCXX_CLASS_REQUIRES2(_a, _b, __gnu_cxx, _C); 78 #define __glibcxx_class_requires3(_a,_b,_c,_C) \ 79 _GLIBCXX_CLASS_REQUIRES3(_a, _b, _c, __gnu_cxx, _C); 80 #define __glibcxx_class_requires4(_a,_b,_c,_d,_C) \ 81 _GLIBCXX_CLASS_REQUIRES4(_a, _b, _c, _d, __gnu_cxx, _C); 82 83 #endif // enable/disable 84 85 #endif // _GLIBCXX_CONCEPT_CHECK 86