concept_check.h

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00001 // Concept-checking control -*- C++ -*-
00002 
00003 // Copyright (C) 2001 Free Software Foundation, Inc.
00004 //
00005 // This file is part of the GNU ISO C++ Library.  This library is free
00006 // software; you can redistribute it and/or modify it under the
00007 // terms of the GNU General Public License as published by the
00008 // Free Software Foundation; either version 2, or (at your option)
00009 // any later version.
00010 
00011 // This library is distributed in the hope that it will be useful,
00012 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00013 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00014 // GNU General Public License for more details.
00015 
00016 // You should have received a copy of the GNU General Public License along
00017 // with this library; see the file COPYING.  If not, write to the Free
00018 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
00019 // USA.
00020 
00021 // As a special exception, you may use this file as part of a free software
00022 // library without restriction.  Specifically, if other files instantiate
00023 // templates or use macros or inline functions from this file, or you compile
00024 // this file and link it with other files to produce an executable, this
00025 // file does not by itself cause the resulting executable to be covered by
00026 // the GNU General Public License.  This exception does not however
00027 // invalidate any other reasons why the executable file might be covered by
00028 // the GNU General Public License.
00029 
00030 /** @file concept_check.h
00031  *  This is an internal header file, included by other library headers.
00032  *  You should not attempt to use it directly.
00033  */
00034 
00035 #ifndef _CONCEPT_CHECK_H
00036 #define _CONCEPT_CHECK_H 1
00037 
00038 #pragma GCC system_header
00039 
00040 #include <bits/c++config.h>
00041 
00042 // All places in libstdc++-v3 where these are used, or /might/ be used, or
00043 // don't need to be used, or perhaps /should/ be used, are commented with
00044 // "concept requirements" (and maybe some more text).  So grep like crazy
00045 // if you're looking for additional places to use these.
00046 
00047 // Concept-checking code is off by default unless users turn it on via
00048 // configure options or editing c++config.h.
00049 
00050 #ifndef _GLIBCXX_CONCEPT_CHECKS
00051 
00052 #define __glibcxx_function_requires(...)
00053 #define __glibcxx_class_requires(_a,_b)
00054 #define __glibcxx_class_requires2(_a,_b,_c)
00055 #define __glibcxx_class_requires3(_a,_b,_c,_d)
00056 #define __glibcxx_class_requires4(_a,_b,_c,_d,_e)
00057 
00058 #else // the checks are on
00059 
00060 #include <bits/boost_concept_check.h>
00061 
00062 // Note that the obvious and elegant approach of
00063 //
00064 //#define glibcxx_function_requires(C) boost::function_requires< boost::C >()
00065 //
00066 // won't work due to concept templates with more than one parameter, e.g.,
00067 // BinaryPredicateConcept.  The preprocessor tries to split things up on
00068 // the commas in the template argument list.  We can't use an inner pair of
00069 // parenthesis to hide the commas, because "boost::(Temp<Foo,Bar>)" isn't
00070 // a valid instantiation pattern.  Thus, we steal a feature from C99.
00071 
00072 #define __glibcxx_function_requires(...)                                 \
00073             __gnu_cxx::__function_requires< __gnu_cxx::__VA_ARGS__ >();
00074 #define __glibcxx_class_requires(_a,_C)                                  \
00075             _GLIBCXX_CLASS_REQUIRES(_a, __gnu_cxx, _C);
00076 #define __glibcxx_class_requires2(_a,_b,_C)                              \
00077             _GLIBCXX_CLASS_REQUIRES2(_a, _b, __gnu_cxx, _C);
00078 #define __glibcxx_class_requires3(_a,_b,_c,_C)                           \
00079             _GLIBCXX_CLASS_REQUIRES3(_a, _b, _c, __gnu_cxx, _C);
00080 #define __glibcxx_class_requires4(_a,_b,_c,_d,_C)                        \
00081             _GLIBCXX_CLASS_REQUIRES4(_a, _b, _c, _d, __gnu_cxx, _C);
00082 
00083 #endif // enable/disable
00084 
00085 #endif // _GLIBCXX_CONCEPT_CHECK

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