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  1. // Concept-checking control -*- C++ -*-
  2.  
  3. // Copyright (C) 2001-2013 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 3, 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. // Under Section 7 of GPL version 3, you are granted additional
  17. // permissions described in the GCC Runtime Library Exception, version
  18. // 3.1, as published by the Free Software Foundation.
  19.  
  20. // You should have received a copy of the GNU General Public License and
  21. // a copy of the GCC Runtime Library Exception along with this program;
  22. // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  23. // <http://www.gnu.org/licenses/>.
  24.  
  25. /** @file bits/concept_check.h
  26.  *  This is an internal header file, included by other library headers.
  27.  *  Do not attempt to use it directly. @headername{iterator}
  28.  */
  29.  
  30. #ifndef _CONCEPT_CHECK_H
  31. #define _CONCEPT_CHECK_H 1
  32.  
  33. #pragma GCC system_header
  34.  
  35. #include <bits/c++config.h>
  36.  
  37. // All places in libstdc++-v3 where these are used, or /might/ be used, or
  38. // don't need to be used, or perhaps /should/ be used, are commented with
  39. // "concept requirements" (and maybe some more text).  So grep like crazy
  40. // if you're looking for additional places to use these.
  41.  
  42. // Concept-checking code is off by default unless users turn it on via
  43. // configure options or editing c++config.h.
  44.  
  45. #ifndef _GLIBCXX_CONCEPT_CHECKS
  46.  
  47. #define __glibcxx_function_requires(...)
  48. #define __glibcxx_class_requires(_a,_b)
  49. #define __glibcxx_class_requires2(_a,_b,_c)
  50. #define __glibcxx_class_requires3(_a,_b,_c,_d)
  51. #define __glibcxx_class_requires4(_a,_b,_c,_d,_e)
  52.  
  53. #else // the checks are on
  54.  
  55. #include <bits/boost_concept_check.h>
  56.  
  57. // Note that the obvious and elegant approach of
  58. //
  59. //#define glibcxx_function_requires(C) debug::function_requires< debug::C >()
  60. //
  61. // won't work due to concept templates with more than one parameter, e.g.,
  62. // BinaryPredicateConcept.  The preprocessor tries to split things up on
  63. // the commas in the template argument list.  We can't use an inner pair of
  64. // parenthesis to hide the commas, because "debug::(Temp<Foo,Bar>)" isn't
  65. // a valid instantiation pattern.  Thus, we steal a feature from C99.
  66.  
  67. #define __glibcxx_function_requires(...)                                 \
  68.             __gnu_cxx::__function_requires< __gnu_cxx::__VA_ARGS__ >();
  69. #define __glibcxx_class_requires(_a,_C)                                  \
  70.             _GLIBCXX_CLASS_REQUIRES(_a, __gnu_cxx, _C);
  71. #define __glibcxx_class_requires2(_a,_b,_C)                              \
  72.             _GLIBCXX_CLASS_REQUIRES2(_a, _b, __gnu_cxx, _C);
  73. #define __glibcxx_class_requires3(_a,_b,_c,_C)                           \
  74.             _GLIBCXX_CLASS_REQUIRES3(_a, _b, _c, __gnu_cxx, _C);
  75. #define __glibcxx_class_requires4(_a,_b,_c,_d,_C)                        \
  76.             _GLIBCXX_CLASS_REQUIRES4(_a, _b, _c, _d, __gnu_cxx, _C);
  77.  
  78. #endif // enable/disable
  79.  
  80. #endif // _GLIBCXX_CONCEPT_CHECK
  81.