| 1 | /*============================================================================= |
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| 2 | Copyright (c) 2014 Eric Niebler |
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| 3 | Copyright (c) 2014 Kohei Takahashi |
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| 4 | |
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| 5 | Distributed under the Boost Software License, Version 1.0. (See accompanying |
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| 6 | file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
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| 7 | ==============================================================================*/ |
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| 8 | #if !defined(FUSION_SUPPORT_CONFIG_01092014_1718) |
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| 9 | #define FUSION_SUPPORT_CONFIG_01092014_1718 |
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| 10 | |
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| 11 | #include <boost/config.hpp> |
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| 12 | #include <boost/detail/workaround.hpp> |
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| 13 | #include <utility> |
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| 14 | |
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| 15 | #ifndef BOOST_FUSION_GPU_ENABLED |
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| 16 | #define BOOST_FUSION_GPU_ENABLED BOOST_GPU_ENABLED |
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| 17 | #endif |
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| 18 | |
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| 19 | // Enclose with inline namespace because unqualified lookup of GCC < 4.5 is broken. |
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| 20 | // |
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| 21 | // namespace detail { |
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| 22 | // struct foo; |
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| 23 | // struct X { }; |
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| 24 | // } |
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| 25 | // |
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| 26 | // template <typename T> void foo(T) { } |
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| 27 | // |
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| 28 | // int main() |
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| 29 | // { |
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| 30 | // foo(detail::X()); |
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| 31 | // // prog.cc: In function 'int main()': |
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| 32 | // // prog.cc:2: error: 'struct detail::foo' is not a function, |
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| 33 | // // prog.cc:6: error: conflict with 'template<class T> void foo(T)' |
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| 34 | // // prog.cc:10: error: in call to 'foo' |
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| 35 | // } |
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| 36 | namespace boost { namespace fusion { namespace detail |
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| 37 | { |
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| 38 | namespace barrier { } |
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| 39 | using namespace barrier; |
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| 40 | }}} |
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| 41 | #define BOOST_FUSION_BARRIER_BEGIN namespace barrier { |
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| 42 | #define BOOST_FUSION_BARRIER_END } |
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| 43 | |
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| 44 | |
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| 45 | #if BOOST_WORKAROUND(BOOST_MSVC, BOOST_TESTED_AT(1900)) |
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| 46 | // All of rvalue-reference ready MSVC don't perform implicit conversion from |
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| 47 | // fundamental type to rvalue-reference of another fundamental type [1]. |
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| 48 | // |
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| 49 | // Following example doesn't compile |
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| 50 | // |
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| 51 | // int i; |
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| 52 | // long &&l = i; // sigh..., std::forward<long&&>(i) also fail. |
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| 53 | // |
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| 54 | // however, following one will work. |
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| 55 | // |
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| 56 | // int i; |
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| 57 | // long &&l = static_cast<long &&>(i); |
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| 58 | // |
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| 59 | // OK, now can we replace all usage of std::forward to static_cast? -- I say NO! |
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| 60 | // All of rvalue-reference ready Clang doesn't compile above static_cast usage [2], sigh... |
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| 61 | // |
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| 62 | // References: |
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| 63 | // 1. https://connect.microsoft.com/VisualStudio/feedback/details/1037806/implicit-conversion-doesnt-perform-for-fund |
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| 64 | // 2. http://llvm.org/bugs/show_bug.cgi?id=19917 |
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| 65 | // |
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| 66 | // Tentatively, we use static_cast to forward if run under MSVC. |
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| 67 | # define BOOST_FUSION_FWD_ELEM(type, value) static_cast<type&&>(value) |
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| 68 | #else |
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| 69 | # define BOOST_FUSION_FWD_ELEM(type, value) std::forward<type>(value) |
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| 70 | #endif |
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| 71 | |
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| 72 | |
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| 73 | // Workaround for LWG 2408: C++17 SFINAE-friendly std::iterator_traits. |
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| 74 | // http://cplusplus.github.io/LWG/lwg-defects.html#2408 |
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| 75 | // |
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| 76 | // - GCC 4.5 enables the feature under C++11. |
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| 77 | // https://gcc.gnu.org/ml/gcc-patches/2014-11/msg01105.html |
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| 78 | // |
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| 79 | // - MSVC 10.0 implements iterator intrinsics; MSVC 13.0 implements LWG2408. |
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| 80 | #if (defined(BOOST_LIBSTDCXX_VERSION) && (BOOST_LIBSTDCXX_VERSION < 40500) && \ |
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| 81 | defined(BOOST_LIBSTDCXX11)) || \ |
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| 82 | (defined(BOOST_MSVC) && (1600 <= BOOST_MSVC && BOOST_MSVC < 1900)) |
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| 83 | # define BOOST_FUSION_WORKAROUND_FOR_LWG_2408 |
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| 84 | namespace std |
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| 85 | { |
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| 86 | template <typename> |
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| 87 | struct iterator_traits; |
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| 88 | } |
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| 89 | #endif |
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| 90 | |
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| 91 | |
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| 92 | // Workaround for older GCC that doesn't accept `this` in constexpr. |
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| 93 | #if BOOST_WORKAROUND(BOOST_GCC, < 40700) |
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| 94 | #define BOOST_FUSION_CONSTEXPR_THIS |
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| 95 | #else |
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| 96 | #define BOOST_FUSION_CONSTEXPR_THIS BOOST_CONSTEXPR |
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| 97 | #endif |
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| 98 | |
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| 99 | #endif |
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| 100 | |
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