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