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82 lines
3.3 KiB
82 lines
3.3 KiB
// Concept-checking control -*- C++ -*-
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// Copyright (C) 2001-2021 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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/** @file bits/concept_check.h
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* This is an internal header file, included by other library headers.
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* Do not attempt to use it directly. @headername{iterator}
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*/
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#ifndef _CONCEPT_CHECK_H
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#define _CONCEPT_CHECK_H 1
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#pragma GCC system_header
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#include <bits/c++config.h>
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// All places in libstdc++-v3 where these are used, or /might/ be used, or
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// don't need to be used, or perhaps /should/ be used, are commented with
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// "concept requirements" (and maybe some more text). So grep like crazy
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// if you're looking for additional places to use these.
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// Concept-checking code is off by default unless users turn it on via
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// configure options or editing c++config.h.
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// It is not supported for freestanding implementations.
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#if !defined(_GLIBCXX_CONCEPT_CHECKS) || !_GLIBCXX_HOSTED
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#define __glibcxx_function_requires(...)
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#define __glibcxx_class_requires(_a,_b)
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#define __glibcxx_class_requires2(_a,_b,_c)
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#define __glibcxx_class_requires3(_a,_b,_c,_d)
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#define __glibcxx_class_requires4(_a,_b,_c,_d,_e)
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#else // the checks are on
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#include <bits/boost_concept_check.h>
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// Note that the obvious and elegant approach of
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//
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//#define glibcxx_function_requires(C) debug::function_requires< debug::C >()
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//
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// won't work due to concept templates with more than one parameter, e.g.,
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// BinaryPredicateConcept. The preprocessor tries to split things up on
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// the commas in the template argument list. We can't use an inner pair of
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// parenthesis to hide the commas, because "debug::(Temp<Foo,Bar>)" isn't
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// a valid instantiation pattern. Thus, we steal a feature from C99.
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#define __glibcxx_function_requires(...) \
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__gnu_cxx::__function_requires< __gnu_cxx::__VA_ARGS__ >();
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#define __glibcxx_class_requires(_a,_C) \
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_GLIBCXX_CLASS_REQUIRES(_a, __gnu_cxx, _C);
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#define __glibcxx_class_requires2(_a,_b,_C) \
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_GLIBCXX_CLASS_REQUIRES2(_a, _b, __gnu_cxx, _C);
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#define __glibcxx_class_requires3(_a,_b,_c,_C) \
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_GLIBCXX_CLASS_REQUIRES3(_a, _b, _c, __gnu_cxx, _C);
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#define __glibcxx_class_requires4(_a,_b,_c,_d,_C) \
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_GLIBCXX_CLASS_REQUIRES4(_a, _b, _c, _d, __gnu_cxx, _C);
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#endif // enable/disable
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#endif // _GLIBCXX_CONCEPT_CHECK
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