mingw/include/c++/3.4.2/bits/concept_check.h

   1 // Concept-checking control -*- C++ -*-
   2
   3 // Copyright (C) 2001 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 2, or (at your option)
   9 // any later version.
  10
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // You should have received a copy of the GNU General Public License along
  17 // with this library; see the file COPYING.  If not, write to the Free
  18 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  19 // USA.
  20
  21 // As a special exception, you may use this file as part of a free software
  22 // library without restriction.  Specifically, if other files instantiate
  23 // templates or use macros or inline functions from this file, or you compile
  24 // this file and link it with other files to produce an executable, this
  25 // file does not by itself cause the resulting executable to be covered by
  26 // the GNU General Public License.  This exception does not however
  27 // invalidate any other reasons why the executable file might be covered by
  28 // the GNU General Public License.
  29
  30 /** @file concept_check.h
  31  *  This is an internal header file, included by other library headers.
  32  *  You should not attempt to use it directly.
  33  */
  34
  35 #ifndef _CONCEPT_CHECK_H
  36 #define _CONCEPT_CHECK_H 1
  37
  38 #pragma GCC system_header
  39
  40 #include <bits/c++config.h>
  41
  42 // All places in libstdc++-v3 where these are used, or /might/ be used, or
  43 // don't need to be used, or perhaps /should/ be used, are commented with
  44 // "concept requirements" (and maybe some more text).  So grep like crazy
  45 // if you're looking for additional places to use these.
  46
  47 // Concept-checking code is off by default unless users turn it on via
  48 // configure options or editing c++config.h.
  49
  50 #ifndef _GLIBCXX_CONCEPT_CHECKS
  51
  52 #define __glibcxx_function_requires(...)
  53 #define __glibcxx_class_requires(_a,_b)
  54 #define __glibcxx_class_requires2(_a,_b,_c)
  55 #define __glibcxx_class_requires3(_a,_b,_c,_d)
  56 #define __glibcxx_class_requires4(_a,_b,_c,_d,_e)
  57
  58 #else // the checks are on
  59
  60 #include <bits/boost_concept_check.h>
  61
  62 // Note that the obvious and elegant approach of
  63 //
  64 //#define glibcxx_function_requires(C) boost::function_requires< boost::C >()
  65 //
  66 // won't work due to concept templates with more than one parameter, e.g.,
  67 // BinaryPredicateConcept.  The preprocessor tries to split things up on
  68 // the commas in the template argument list.  We can't use an inner pair of
  69 // parenthesis to hide the commas, because "boost::(Temp<Foo,Bar>)" isn't
  70 // a valid instantiation pattern.  Thus, we steal a feature from C99.
  71
  72 #define __glibcxx_function_requires(...)                                 \
  73             __gnu_cxx::__function_requires< __gnu_cxx::__VA_ARGS__ >();
  74 #define __glibcxx_class_requires(_a,_C)                                  \
  75             _GLIBCXX_CLASS_REQUIRES(_a, __gnu_cxx, _C);
  76 #define __glibcxx_class_requires2(_a,_b,_C)                              \
  77             _GLIBCXX_CLASS_REQUIRES2(_a, _b, __gnu_cxx, _C);
  78 #define __glibcxx_class_requires3(_a,_b,_c,_C)                           \
  79             _GLIBCXX_CLASS_REQUIRES3(_a, _b, _c, __gnu_cxx, _C);
  80 #define __glibcxx_class_requires4(_a,_b,_c,_d,_C)                        \
  81             _GLIBCXX_CLASS_REQUIRES4(_a, _b, _c, _d, __gnu_cxx, _C);
  82
  83 #endif // enable/disable
  84
  85 #endif // _GLIBCXX_CONCEPT_CHECK