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// Concept-checking control -*- C++ -*-

// Copyright (C) 2001, 2009, 2010 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.

#ifndef _GLIBCXX_CONCEPT_CHECKS

#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