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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.
-
- /** @file concept_check.h
- * This is an internal header file, included by other library headers.
- * You should not attempt to use it directly.
- */
-
- #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) 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. 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
-