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// Concept-checking control -*- C++ -*-
// Copyright (C) 2001 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 2, 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.
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING. If not, write to the Free
// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
// USA.
// As a special exception, you may use this file as part of a free software
// library without restriction. Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the GNU General Public License. This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.
#ifndef _GLIBCPP_CONCEPT_CHECK
#define _GLIBCPP_CONCEPT_CHECK 1
#pragma GCC system_header
#include <bits/c++config.h>
// Concept-checking code is on by default unless users turn it off via any
// of these methods:
// - _GLIBCPP_NO_CONCEPT_CHECKS is a user hook; defining it disables the
// checks.
// - _STL_NO_CONCEPT_CHECKS is a user hook from the old STL implementation
// specifically for this purpose; defining it disables the checks, in
// case the user is expecting the old version.
// - NDEBUG is the usual macro that kills assert(). Defining it will also
// disable the checks, by the reasoning that if the user doesn't want
// any runtime assertion code, then no space penalty for the checks
// is desired either.
// 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.
#if defined(_GLIBCPP_NO_CONCEPT_CHECKS) || defined(_STL_NO_CONCEPT_CHECKS) \
|| defined(NDEBUG)
#define glibcpp_function_requires(...)
#define glibcpp_class_requires(a,b)
#define glibcpp_class_requires2(a,b,c)
#define glibcpp_class_requires3(a,b,c,d)
#define glibcpp_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 glibcpp_function_requires(C) \
// boost::function_requires< boost::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 "boost::(Temp<Foo,Bar>)" isn't
// a valid instantiation pattern.
#define glibcpp_function_requires(...) \
boost::function_requires< boost::__VA_ARGS__ >()
#define glibcpp_class_requires(a,C) \
BOOST_CLASS_REQUIRES(a, boost, C)
#define glibcpp_class_requires2(a,b,C) \
BOOST_CLASS_REQUIRES2(a, b, boost, C)
#define glibcpp_class_requires3(a,b,c,C) \
BOOST_CLASS_REQUIRES3(a, b, c, boost, C)
#define glibcpp_class_requires4(a,b,c,d,C) \
BOOST_CLASS_REQUIRES4(a, b, c, d, boost, C)
#endif // enable/disable
#endif // _GLIBCPP_CONCEPT_CHECK
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