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1 | /*============================================================================= |
2 | Copyright (c) 2014 Eric Niebler | |
3 | Copyright (c) 2014 Kohei Takahashi | |
4 | ||
5 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
6 | file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
7 | ==============================================================================*/ | |
8 | #if !defined(FUSION_SUPPORT_CONFIG_01092014_1718) | |
9 | #define FUSION_SUPPORT_CONFIG_01092014_1718 | |
10 | ||
11 | #include <boost/config.hpp> | |
12 | #include <boost/detail/workaround.hpp> | |
13 | #include <utility> | |
14 | ||
15 | #ifndef BOOST_FUSION_GPU_ENABLED | |
16 | #define BOOST_FUSION_GPU_ENABLED BOOST_GPU_ENABLED | |
17 | #endif | |
18 | ||
19 | // Enclose with inline namespace because unqualified lookup of GCC < 4.5 is broken. | |
20 | // | |
21 | // namespace detail { | |
22 | // struct foo; | |
23 | // struct X { }; | |
24 | // } | |
25 | // | |
26 | // template <typename T> void foo(T) { } | |
27 | // | |
28 | // int main() | |
29 | // { | |
30 | // foo(detail::X()); | |
31 | // // prog.cc: In function 'int main()': | |
32 | // // prog.cc:2: error: 'struct detail::foo' is not a function, | |
33 | // // prog.cc:6: error: conflict with 'template<class T> void foo(T)' | |
34 | // // prog.cc:10: error: in call to 'foo' | |
35 | // } | |
36 | namespace boost { namespace fusion { namespace detail | |
37 | { | |
38 | namespace barrier { } | |
39 | using namespace barrier; | |
40 | }}} | |
41 | #define BOOST_FUSION_BARRIER_BEGIN namespace barrier { | |
42 | #define BOOST_FUSION_BARRIER_END } | |
43 | ||
44 | ||
45 | #if BOOST_WORKAROUND(BOOST_MSVC, BOOST_TESTED_AT(1900)) | |
46 | // All of rvalue-reference ready MSVC don't perform implicit conversion from | |
47 | // fundamental type to rvalue-reference of another fundamental type [1]. | |
48 | // | |
49 | // Following example doesn't compile | |
50 | // | |
51 | // int i; | |
52 | // long &&l = i; // sigh..., std::forward<long&&>(i) also fail. | |
53 | // | |
54 | // however, following one will work. | |
55 | // | |
56 | // int i; | |
57 | // long &&l = static_cast<long &&>(i); | |
58 | // | |
59 | // OK, now can we replace all usage of std::forward to static_cast? -- I say NO! | |
60 | // All of rvalue-reference ready Clang doesn't compile above static_cast usage [2], sigh... | |
61 | // | |
62 | // References: | |
63 | // 1. https://connect.microsoft.com/VisualStudio/feedback/details/1037806/implicit-conversion-doesnt-perform-for-fund | |
64 | // 2. http://llvm.org/bugs/show_bug.cgi?id=19917 | |
65 | // | |
66 | // Tentatively, we use static_cast to forward if run under MSVC. | |
67 | # define BOOST_FUSION_FWD_ELEM(type, value) static_cast<type&&>(value) | |
68 | #else | |
69 | # define BOOST_FUSION_FWD_ELEM(type, value) std::forward<type>(value) | |
70 | #endif | |
71 | ||
72 | ||
73 | // Workaround for LWG 2408: C++17 SFINAE-friendly std::iterator_traits. | |
74 | // http://cplusplus.github.io/LWG/lwg-defects.html#2408 | |
75 | // | |
76 | // - GCC 4.5 enables the feature under C++11. | |
77 | // https://gcc.gnu.org/ml/gcc-patches/2014-11/msg01105.html | |
78 | // | |
79 | // - MSVC 10.0 implements iterator intrinsics; MSVC 13.0 implements LWG2408. | |
80 | #if (defined(BOOST_LIBSTDCXX_VERSION) && (BOOST_LIBSTDCXX_VERSION < 40500) && \ | |
81 | defined(BOOST_LIBSTDCXX11)) || \ | |
82 | (defined(BOOST_MSVC) && (1600 <= BOOST_MSVC && BOOST_MSVC < 1900)) | |
83 | # define BOOST_FUSION_WORKAROUND_FOR_LWG_2408 | |
84 | namespace std | |
85 | { | |
86 | template <typename> | |
87 | struct iterator_traits; | |
88 | } | |
89 | #endif | |
90 | ||
91 | ||
92 | // Workaround for older GCC that doesn't accept `this` in constexpr. | |
93 | #if BOOST_WORKAROUND(BOOST_GCC, < 40700) | |
94 | #define BOOST_FUSION_CONSTEXPR_THIS | |
95 | #else | |
96 | #define BOOST_FUSION_CONSTEXPR_THIS BOOST_CONSTEXPR | |
97 | #endif | |
98 | ||
99 | #endif |