// Concept-checking control -*- C++ -*- // Copyright (C) 2001-2020 Free Software Foundation, Inc. // // This file is part of the GNU ISO C++ Library. This library is free // software; you can redistribute it and/or modify it under the // terms of the GNU General Public License as published by the // Free Software Foundation; either version 3, or (at your option) // any later version. // This library is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // Under Section 7 of GPL version 3, you are granted additional // permissions described in the GCC Runtime Library Exception, version // 3.1, as published by the Free Software Foundation. // You should have received a copy of the GNU General Public License and // a copy of the GCC Runtime Library Exception along with this program; // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see // <http://www.gnu.org/licenses/>. /** @file bits/concept_check.h * This is an internal header file, included by other library headers. * Do not attempt to use it directly. @headername{iterator} */ #ifndef _CONCEPT_CHECK_H #define _CONCEPT_CHECK_H 1 #pragma GCC system_header #include <bits/c++config.h> // All places in libstdc++-v3 where these are used, or /might/ be used, or // don't need to be used, or perhaps /should/ be used, are commented with // "concept requirements" (and maybe some more text). So grep like crazy // if you're looking for additional places to use these. // Concept-checking code is off by default unless users turn it on via // configure options or editing c++config.h. // It is not supported for freestanding implementations. #if !defined(_GLIBCXX_CONCEPT_CHECKS) || !_GLIBCXX_HOSTED #define __glibcxx_function_requires(...) #define __glibcxx_class_requires(_a,_b) #define __glibcxx_class_requires2(_a,_b,_c) #define __glibcxx_class_requires3(_a,_b,_c,_d) #define __glibcxx_class_requires4(_a,_b,_c,_d,_e) #else // the checks are on #include <bits/boost_concept_check.h> // Note that the obvious and elegant approach of // //#define glibcxx_function_requires(C) debug::function_requires< debug::C >() // // won't work due to concept templates with more than one parameter, e.g., // BinaryPredicateConcept. The preprocessor tries to split things up on // the commas in the template argument list. We can't use an inner pair of // parenthesis to hide the commas, because "debug::(Temp<Foo,Bar>)" isn't // a valid instantiation pattern. Thus, we steal a feature from C99. #define __glibcxx_function_requires(...) \ __gnu_cxx::__function_requires< __gnu_cxx::__VA_ARGS__ >(); #define __glibcxx_class_requires(_a,_C) \ _GLIBCXX_CLASS_REQUIRES(_a, __gnu_cxx, _C); #define __glibcxx_class_requires2(_a,_b,_C) \ _GLIBCXX_CLASS_REQUIRES2(_a, _b, __gnu_cxx, _C); #define __glibcxx_class_requires3(_a,_b,_c,_C) \ _GLIBCXX_CLASS_REQUIRES3(_a, _b, _c, __gnu_cxx, _C); #define __glibcxx_class_requires4(_a,_b,_c,_d,_C) \ _GLIBCXX_CLASS_REQUIRES4(_a, _b, _c, _d, __gnu_cxx, _C); #endif // enable/disable #endif // _GLIBCXX_CONCEPT_CHECK