1*38fd1498Szrj // Concept-checking control -*- C++ -*- 2*38fd1498Szrj 3*38fd1498Szrj // Copyright (C) 2001-2018 Free Software Foundation, Inc. 4*38fd1498Szrj // 5*38fd1498Szrj // This file is part of the GNU ISO C++ Library. This library is free 6*38fd1498Szrj // software; you can redistribute it and/or modify it under the 7*38fd1498Szrj // terms of the GNU General Public License as published by the 8*38fd1498Szrj // Free Software Foundation; either version 3, or (at your option) 9*38fd1498Szrj // any later version. 10*38fd1498Szrj 11*38fd1498Szrj // This library is distributed in the hope that it will be useful, 12*38fd1498Szrj // but WITHOUT ANY WARRANTY; without even the implied warranty of 13*38fd1498Szrj // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14*38fd1498Szrj // GNU General Public License for more details. 15*38fd1498Szrj 16*38fd1498Szrj // Under Section 7 of GPL version 3, you are granted additional 17*38fd1498Szrj // permissions described in the GCC Runtime Library Exception, version 18*38fd1498Szrj // 3.1, as published by the Free Software Foundation. 19*38fd1498Szrj 20*38fd1498Szrj // You should have received a copy of the GNU General Public License and 21*38fd1498Szrj // a copy of the GCC Runtime Library Exception along with this program; 22*38fd1498Szrj // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23*38fd1498Szrj // <http://www.gnu.org/licenses/>. 24*38fd1498Szrj 25*38fd1498Szrj /** @file bits/concept_check.h 26*38fd1498Szrj * This is an internal header file, included by other library headers. 27*38fd1498Szrj * Do not attempt to use it directly. @headername{iterator} 28*38fd1498Szrj */ 29*38fd1498Szrj 30*38fd1498Szrj #ifndef _CONCEPT_CHECK_H 31*38fd1498Szrj #define _CONCEPT_CHECK_H 1 32*38fd1498Szrj 33*38fd1498Szrj #pragma GCC system_header 34*38fd1498Szrj 35*38fd1498Szrj #include <bits/c++config.h> 36*38fd1498Szrj 37*38fd1498Szrj // All places in libstdc++-v3 where these are used, or /might/ be used, or 38*38fd1498Szrj // don't need to be used, or perhaps /should/ be used, are commented with 39*38fd1498Szrj // "concept requirements" (and maybe some more text). So grep like crazy 40*38fd1498Szrj // if you're looking for additional places to use these. 41*38fd1498Szrj 42*38fd1498Szrj // Concept-checking code is off by default unless users turn it on via 43*38fd1498Szrj // configure options or editing c++config.h. 44*38fd1498Szrj // It is not supported for freestanding implementations. 45*38fd1498Szrj 46*38fd1498Szrj #if !defined(_GLIBCXX_CONCEPT_CHECKS) || !_GLIBCXX_HOSTED 47*38fd1498Szrj 48*38fd1498Szrj #define __glibcxx_function_requires(...) 49*38fd1498Szrj #define __glibcxx_class_requires(_a,_b) 50*38fd1498Szrj #define __glibcxx_class_requires2(_a,_b,_c) 51*38fd1498Szrj #define __glibcxx_class_requires3(_a,_b,_c,_d) 52*38fd1498Szrj #define __glibcxx_class_requires4(_a,_b,_c,_d,_e) 53*38fd1498Szrj 54*38fd1498Szrj #else // the checks are on 55*38fd1498Szrj 56*38fd1498Szrj #include <bits/boost_concept_check.h> 57*38fd1498Szrj 58*38fd1498Szrj // Note that the obvious and elegant approach of 59*38fd1498Szrj // 60*38fd1498Szrj //#define glibcxx_function_requires(C) debug::function_requires< debug::C >() 61*38fd1498Szrj // 62*38fd1498Szrj // won't work due to concept templates with more than one parameter, e.g., 63*38fd1498Szrj // BinaryPredicateConcept. The preprocessor tries to split things up on 64*38fd1498Szrj // the commas in the template argument list. We can't use an inner pair of 65*38fd1498Szrj // parenthesis to hide the commas, because "debug::(Temp<Foo,Bar>)" isn't 66*38fd1498Szrj // a valid instantiation pattern. Thus, we steal a feature from C99. 67*38fd1498Szrj 68*38fd1498Szrj #define __glibcxx_function_requires(...) \ 69*38fd1498Szrj __gnu_cxx::__function_requires< __gnu_cxx::__VA_ARGS__ >(); 70*38fd1498Szrj #define __glibcxx_class_requires(_a,_C) \ 71*38fd1498Szrj _GLIBCXX_CLASS_REQUIRES(_a, __gnu_cxx, _C); 72*38fd1498Szrj #define __glibcxx_class_requires2(_a,_b,_C) \ 73*38fd1498Szrj _GLIBCXX_CLASS_REQUIRES2(_a, _b, __gnu_cxx, _C); 74*38fd1498Szrj #define __glibcxx_class_requires3(_a,_b,_c,_C) \ 75*38fd1498Szrj _GLIBCXX_CLASS_REQUIRES3(_a, _b, _c, __gnu_cxx, _C); 76*38fd1498Szrj #define __glibcxx_class_requires4(_a,_b,_c,_d,_C) \ 77*38fd1498Szrj _GLIBCXX_CLASS_REQUIRES4(_a, _b, _c, _d, __gnu_cxx, _C); 78*38fd1498Szrj 79*38fd1498Szrj #endif // enable/disable 80*38fd1498Szrj 81*38fd1498Szrj #endif // _GLIBCXX_CONCEPT_CHECK 82