100 lines
3.3 KiB
C++
100 lines
3.3 KiB
C++
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/*=============================================================================
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Copyright (c) 2014 Eric Niebler
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Copyright (c) 2014 Kohei Takahashi
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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==============================================================================*/
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#if !defined(FUSION_SUPPORT_CONFIG_01092014_1718)
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#define FUSION_SUPPORT_CONFIG_01092014_1718
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#include <boost/config.hpp>
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#include <boost/detail/workaround.hpp>
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#include <utility>
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#ifndef BOOST_FUSION_GPU_ENABLED
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#define BOOST_FUSION_GPU_ENABLED BOOST_GPU_ENABLED
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#endif
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// Enclose with inline namespace because unqualified lookup of GCC < 4.5 is broken.
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//
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// namespace detail {
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// struct foo;
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// struct X { };
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// }
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//
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// template <typename T> void foo(T) { }
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//
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// int main()
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// {
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// foo(detail::X());
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// // prog.cc: In function 'int main()':
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// // prog.cc:2: error: 'struct detail::foo' is not a function,
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// // prog.cc:6: error: conflict with 'template<class T> void foo(T)'
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// // prog.cc:10: error: in call to 'foo'
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// }
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namespace boost { namespace fusion { namespace detail
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{
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namespace barrier { }
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using namespace barrier;
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}}}
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#define BOOST_FUSION_BARRIER_BEGIN namespace barrier {
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#define BOOST_FUSION_BARRIER_END }
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#if BOOST_WORKAROUND(BOOST_MSVC, BOOST_TESTED_AT(1900))
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// All of rvalue-reference ready MSVC don't perform implicit conversion from
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// fundamental type to rvalue-reference of another fundamental type [1].
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//
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// Following example doesn't compile
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//
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// int i;
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// long &&l = i; // sigh..., std::forward<long&&>(i) also fail.
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//
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// however, following one will work.
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//
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// int i;
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// long &&l = static_cast<long &&>(i);
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//
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// OK, now can we replace all usage of std::forward to static_cast? -- I say NO!
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// All of rvalue-reference ready Clang doesn't compile above static_cast usage [2], sigh...
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//
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// References:
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// 1. https://connect.microsoft.com/VisualStudio/feedback/details/1037806/implicit-conversion-doesnt-perform-for-fund
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// 2. http://llvm.org/bugs/show_bug.cgi?id=19917
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//
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// Tentatively, we use static_cast to forward if run under MSVC.
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# define BOOST_FUSION_FWD_ELEM(type, value) static_cast<type&&>(value)
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#else
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# define BOOST_FUSION_FWD_ELEM(type, value) std::forward<type>(value)
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#endif
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// Workaround for LWG 2408: C++17 SFINAE-friendly std::iterator_traits.
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// http://cplusplus.github.io/LWG/lwg-defects.html#2408
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//
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// - GCC 4.5 enables the feature under C++11.
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// https://gcc.gnu.org/ml/gcc-patches/2014-11/msg01105.html
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//
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// - MSVC 10.0 implements iterator intrinsics; MSVC 13.0 implements LWG2408.
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#if (defined(BOOST_LIBSTDCXX_VERSION) && (BOOST_LIBSTDCXX_VERSION < 40500) && \
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defined(BOOST_LIBSTDCXX11)) || \
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(defined(BOOST_MSVC) && (1600 <= BOOST_MSVC && BOOST_MSVC < 1900))
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# define BOOST_FUSION_WORKAROUND_FOR_LWG_2408
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namespace std
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{
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template <typename>
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struct iterator_traits;
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}
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#endif
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// Workaround for older GCC that doesn't accept `this` in constexpr.
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#if BOOST_WORKAROUND(BOOST_GCC, < 40700)
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#define BOOST_FUSION_CONSTEXPR_THIS
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#else
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#define BOOST_FUSION_CONSTEXPR_THIS BOOST_CONSTEXPR
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#endif
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#endif
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