| 1 | // Concept-checking control -*- C++ -*- |
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| 2 | |
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| 3 | // Copyright (C) 2001-2021 Free Software Foundation, Inc. |
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| 4 | // |
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| 5 | // This file is part of the GNU ISO C++ Library. This library is free |
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| 6 | // software; you can redistribute it and/or modify it under the |
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| 7 | // terms of the GNU General Public License as published by the |
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| 8 | // Free Software Foundation; either version 3, or (at your option) |
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| 9 | // any later version. |
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| 10 | |
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| 11 | // This library is distributed in the hope that it will be useful, |
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| 12 | // but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 13 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 14 | // GNU General Public License for more details. |
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| 15 | |
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| 16 | // Under Section 7 of GPL version 3, you are granted additional |
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| 17 | // permissions described in the GCC Runtime Library Exception, version |
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| 18 | // 3.1, as published by the Free Software Foundation. |
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| 19 | |
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| 20 | // You should have received a copy of the GNU General Public License and |
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| 21 | // a copy of the GCC Runtime Library Exception along with this program; |
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| 22 | // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see |
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| 23 | // <http://www.gnu.org/licenses/>. |
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| 24 | |
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| 25 | /** @file bits/concept_check.h |
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| 26 | * This is an internal header file, included by other library headers. |
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| 27 | * Do not attempt to use it directly. @headername{iterator} |
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| 28 | */ |
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| 29 | |
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| 30 | #ifndef _CONCEPT_CHECK_H |
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| 31 | #define _CONCEPT_CHECK_H 1 |
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| 32 | |
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| 33 | #pragma GCC system_header |
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| 34 | |
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| 35 | #include <bits/c++config.h> |
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| 36 | |
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| 37 | // All places in libstdc++-v3 where these are used, or /might/ be used, or |
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| 38 | // don't need to be used, or perhaps /should/ be used, are commented with |
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| 39 | // "concept requirements" (and maybe some more text). So grep like crazy |
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| 40 | // if you're looking for additional places to use these. |
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| 41 | |
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| 42 | // Concept-checking code is off by default unless users turn it on via |
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| 43 | // configure options or editing c++config.h. |
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| 44 | // It is not supported for freestanding implementations. |
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| 45 | |
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| 46 | #if !defined(_GLIBCXX_CONCEPT_CHECKS) || !_GLIBCXX_HOSTED |
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| 47 | |
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| 48 | #define __glibcxx_function_requires(...) |
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| 49 | #define __glibcxx_class_requires(_a,_b) |
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| 50 | #define __glibcxx_class_requires2(_a,_b,_c) |
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| 51 | #define __glibcxx_class_requires3(_a,_b,_c,_d) |
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| 52 | #define __glibcxx_class_requires4(_a,_b,_c,_d,_e) |
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| 53 | |
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| 54 | #else // the checks are on |
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| 55 | |
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| 56 | #include <bits/boost_concept_check.h> |
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| 57 | |
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| 58 | // Note that the obvious and elegant approach of |
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| 59 | // |
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| 60 | //#define glibcxx_function_requires(C) debug::function_requires< debug::C >() |
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| 61 | // |
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| 62 | // won't work due to concept templates with more than one parameter, e.g., |
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| 63 | // BinaryPredicateConcept. The preprocessor tries to split things up on |
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| 64 | // the commas in the template argument list. We can't use an inner pair of |
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| 65 | // parenthesis to hide the commas, because "debug::(Temp<Foo,Bar>)" isn't |
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| 66 | // a valid instantiation pattern. Thus, we steal a feature from C99. |
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| 67 | |
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| 68 | #define __glibcxx_function_requires(...) \ |
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| 69 | __gnu_cxx::__function_requires< __gnu_cxx::__VA_ARGS__ >(); |
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| 70 | #define __glibcxx_class_requires(_a,_C) \ |
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| 71 | _GLIBCXX_CLASS_REQUIRES(_a, __gnu_cxx, _C); |
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| 72 | #define __glibcxx_class_requires2(_a,_b,_C) \ |
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| 73 | _GLIBCXX_CLASS_REQUIRES2(_a, _b, __gnu_cxx, _C); |
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| 74 | #define __glibcxx_class_requires3(_a,_b,_c,_C) \ |
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| 75 | _GLIBCXX_CLASS_REQUIRES3(_a, _b, _c, __gnu_cxx, _C); |
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| 76 | #define __glibcxx_class_requires4(_a,_b,_c,_d,_C) \ |
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| 77 | _GLIBCXX_CLASS_REQUIRES4(_a, _b, _c, _d, __gnu_cxx, _C); |
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| 78 | |
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| 79 | #endif // enable/disable |
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| 80 | |
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| 81 | #endif // _GLIBCXX_CONCEPT_CHECK |
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| 82 | |
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