# concept_check.h

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    00001 // Concept-checking control -*- C++ -*-
    00002
    00003 // Copyright (C) 2001, 2009 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 3, 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 // Under Section 7 of GPL version 3, you are granted additional
    00017 // permissions described in the GCC Runtime Library Exception, version
    00018 // 3.1, as published by the Free Software Foundation.
    00019
    00020 // You should have received a copy of the GNU General Public License and
    00021 // a copy of the GCC Runtime Library Exception along with this program;
    00022 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
    00023 // <http://www.gnu.org/licenses/>.
    00024
    00025 /** @file concept_check.h
    00026  *  This is an internal header file, included by other library headers.
    00027  *  You should not attempt to use it directly.
    00028  */
    00029
    00030 #ifndef _CONCEPT_CHECK_H
    00031 #define _CONCEPT_CHECK_H 1
    00032
    00033 #pragma GCC system_header
    00034
    00035 #include <bits/c++config.h>
    00036
    00037 // All places in libstdc++-v3 where these are used, or /might/ be used, or
    00038 // don't need to be used, or perhaps /should/ be used, are commented with
    00039 // "concept requirements" (and maybe some more text).  So grep like crazy
    00040 // if you're looking for additional places to use these.
    00041
    00042 // Concept-checking code is off by default unless users turn it on via
    00043 // configure options or editing c++config.h.
    00044
    00045 #ifndef _GLIBCXX_CONCEPT_CHECKS
    00046
    00047 #define __glibcxx_function_requires(...)
    00048 #define __glibcxx_class_requires(_a,_b)
    00049 #define __glibcxx_class_requires2(_a,_b,_c)
    00050 #define __glibcxx_class_requires3(_a,_b,_c,_d)
    00051 #define __glibcxx_class_requires4(_a,_b,_c,_d,_e)
    00052
    00053 #else // the checks are on
    00054
    00055 #include <bits/boost_concept_check.h>
    00056
    00057 // Note that the obvious and elegant approach of
    00058 //
    00059 //#define glibcxx_function_requires(C) boost::function_requires< boost::C >()
    00060 //
    00061 // won't work due to concept templates with more than one parameter, e.g.,
    00062 // BinaryPredicateConcept.  The preprocessor tries to split things up on
    00063 // the commas in the template argument list.  We can't use an inner pair of
    00064 // parenthesis to hide the commas, because "boost::(Temp<Foo,Bar>)" isn't
    00065 // a valid instantiation pattern.  Thus, we steal a feature from C99.
    00066
    00067 #define __glibcxx_function_requires(...)                                 \
    00068             __gnu_cxx::__function_requires< __gnu_cxx::__VA_ARGS__ >();
    00069 #define __glibcxx_class_requires(_a,_C)                                  \
    00070             _GLIBCXX_CLASS_REQUIRES(_a, __gnu_cxx, _C);
    00071 #define __glibcxx_class_requires2(_a,_b,_C)                              \
    00072             _GLIBCXX_CLASS_REQUIRES2(_a, _b, __gnu_cxx, _C);
    00073 #define __glibcxx_class_requires3(_a,_b,_c,_C)                           \
    00074             _GLIBCXX_CLASS_REQUIRES3(_a, _b, _c, __gnu_cxx, _C);
    00075 #define __glibcxx_class_requires4(_a,_b,_c,_d,_C)                        \
    00076             _GLIBCXX_CLASS_REQUIRES4(_a, _b, _c, _d, __gnu_cxx, _C);
    00077
    00078 #endif // enable/disable
    00079
    00080 #endif // _GLIBCXX_CONCEPT_CHECK