1// Concept-checking control -*- C++ -*- 2 3// Copyright (C) 2001, 2009, 2010 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 3, 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// Under Section 7 of GPL version 3, you are granted additional 17// permissions described in the GCC Runtime Library Exception, version 18// 3.1, as published by the Free Software Foundation. 19 20// You should have received a copy of the GNU General Public License and 21// a copy of the GCC Runtime Library Exception along with this program; 22// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23// <http://www.gnu.org/licenses/>. 24 25/** @file bits/concept_check.h 26 * This is an internal header file, included by other library headers. 27 * Do not attempt to use it directly. @headername{iterator} 28 */ 29 30#ifndef _CONCEPT_CHECK_H 31#define _CONCEPT_CHECK_H 1 32 33#pragma GCC system_header 34 35#include <bits/c++config.h> 36 37// All places in libstdc++-v3 where these are used, or /might/ be used, or 38// don't need to be used, or perhaps /should/ be used, are commented with 39// "concept requirements" (and maybe some more text). So grep like crazy 40// if you're looking for additional places to use these. 41 42// Concept-checking code is off by default unless users turn it on via 43// configure options or editing c++config.h. 44 45#ifndef _GLIBCXX_CONCEPT_CHECKS 46 47#define __glibcxx_function_requires(...) 48#define __glibcxx_class_requires(_a,_b) 49#define __glibcxx_class_requires2(_a,_b,_c) 50#define __glibcxx_class_requires3(_a,_b,_c,_d) 51#define __glibcxx_class_requires4(_a,_b,_c,_d,_e) 52 53#else // the checks are on 54 55#include <bits/boost_concept_check.h> 56 57// Note that the obvious and elegant approach of 58// 59//#define glibcxx_function_requires(C) boost::function_requires< boost::C >() 60// 61// won't work due to concept templates with more than one parameter, e.g., 62// BinaryPredicateConcept. The preprocessor tries to split things up on 63// the commas in the template argument list. We can't use an inner pair of 64// parenthesis to hide the commas, because "boost::(Temp<Foo,Bar>)" isn't 65// a valid instantiation pattern. Thus, we steal a feature from C99. 66 67#define __glibcxx_function_requires(...) \ 68 __gnu_cxx::__function_requires< __gnu_cxx::__VA_ARGS__ >(); 69#define __glibcxx_class_requires(_a,_C) \ 70 _GLIBCXX_CLASS_REQUIRES(_a, __gnu_cxx, _C); 71#define __glibcxx_class_requires2(_a,_b,_C) \ 72 _GLIBCXX_CLASS_REQUIRES2(_a, _b, __gnu_cxx, _C); 73#define __glibcxx_class_requires3(_a,_b,_c,_C) \ 74 _GLIBCXX_CLASS_REQUIRES3(_a, _b, _c, __gnu_cxx, _C); 75#define __glibcxx_class_requires4(_a,_b,_c,_d,_C) \ 76 _GLIBCXX_CLASS_REQUIRES4(_a, _b, _c, _d, __gnu_cxx, _C); 77 78#endif // enable/disable 79 80#endif // _GLIBCXX_CONCEPT_CHECK 81