1 | // Concept-checking control -*- C++ -*- |
2 | |
3 | // Copyright (C) 2001-2017 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 | // It is not supported for freestanding implementations. |
45 | |
46 | #if !defined(_GLIBCXX_CONCEPT_CHECKS) || !_GLIBCXX_HOSTED |
47 | |
48 | #define __glibcxx_function_requires(...) |
49 | #define __glibcxx_class_requires(_a,_b) |
50 | #define __glibcxx_class_requires2(_a,_b,_c) |
51 | #define __glibcxx_class_requires3(_a,_b,_c,_d) |
52 | #define __glibcxx_class_requires4(_a,_b,_c,_d,_e) |
53 | |
54 | #else // the checks are on |
55 | |
56 | #include <bits/boost_concept_check.h> |
57 | |
58 | // Note that the obvious and elegant approach of |
59 | // |
60 | //#define glibcxx_function_requires(C) debug::function_requires< debug::C >() |
61 | // |
62 | // won't work due to concept templates with more than one parameter, e.g., |
63 | // BinaryPredicateConcept. The preprocessor tries to split things up on |
64 | // the commas in the template argument list. We can't use an inner pair of |
65 | // parenthesis to hide the commas, because "debug::(Temp<Foo,Bar>)" isn't |
66 | // a valid instantiation pattern. Thus, we steal a feature from C99. |
67 | |
68 | #define __glibcxx_function_requires(...) \ |
69 | __gnu_cxx::__function_requires< __gnu_cxx::__VA_ARGS__ >(); |
70 | #define __glibcxx_class_requires(_a,_C) \ |
71 | _GLIBCXX_CLASS_REQUIRES(_a, __gnu_cxx, _C); |
72 | #define __glibcxx_class_requires2(_a,_b,_C) \ |
73 | _GLIBCXX_CLASS_REQUIRES2(_a, _b, __gnu_cxx, _C); |
74 | #define __glibcxx_class_requires3(_a,_b,_c,_C) \ |
75 | _GLIBCXX_CLASS_REQUIRES3(_a, _b, _c, __gnu_cxx, _C); |
76 | #define __glibcxx_class_requires4(_a,_b,_c,_d,_C) \ |
77 | _GLIBCXX_CLASS_REQUIRES4(_a, _b, _c, _d, __gnu_cxx, _C); |
78 | |
79 | #endif // enable/disable |
80 | |
81 | #endif // _GLIBCXX_CONCEPT_CHECK |
82 | |