forked from boostorg/unordered
65 lines
2.0 KiB
C++
65 lines
2.0 KiB
C++
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// Copyright (C) 2008-2016 Daniel James.
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// Copyright (C) 2022 Christian Mazakas
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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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#ifndef BOOST_UNORDERED_FWD_HPP_INCLUDED
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#define BOOST_UNORDERED_FWD_HPP_INCLUDED
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#include <boost/config.hpp>
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#if defined(BOOST_HAS_PRAGMA_ONCE)
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#pragma once
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#endif
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#include <boost/predef.h>
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#if defined(BOOST_UNORDERED_HAVE_PIECEWISE_CONSTRUCT)
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// Already defined.
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#elif defined(BOOST_LIBSTDCXX11)
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// https://github.com/gcc-mirror/gcc/blob/gcc-4_6-branch/libstdc++-v3/include/bits/stl_pair.h#L70
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#if BOOST_LIBSTDCXX_VERSION > 40600
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#define BOOST_UNORDERED_HAVE_PIECEWISE_CONSTRUCT 1
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#endif
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#elif BOOST_LIB_STD_CXX
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// https://github.com/llvm-mirror/libcxx/blob/release_30/include/utility#L206
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#if BOOST_LIB_STD_CXX >= BOOST_VERSION_NUMBER(3, 0, 0)
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#define BOOST_UNORDERED_HAVE_PIECEWISE_CONSTRUCT 1
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#endif
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#elif defined(BOOST_LIB_STD_DINKUMWARE)
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// Apparently C++11 standard supported in Visual Studio 2012
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// https://msdn.microsoft.com/en-us/library/hh567368.aspx#stl
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// 2012 = VC+11 = BOOST_MSVC 1700 Hopefully!
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// I have no idea when Dinkumware added it, probably a lot
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// earlier than this check.
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#if BOOST_LIB_STD_DINKUMWARE >= BOOST_VERSION_NUMBER(6, 10, 0) || \
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BOOST_COMP_MSVC >= BOOST_VERSION_NUMBER(17, 0, 0)
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#define BOOST_UNORDERED_HAVE_PIECEWISE_CONSTRUCT 1
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#endif
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#endif
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// Assume that an unknown library does not support piecewise construction.
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#if !defined(BOOST_UNORDERED_HAVE_PIECEWISE_CONSTRUCT)
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#define BOOST_UNORDERED_HAVE_PIECEWISE_CONSTRUCT 0
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#endif
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#if BOOST_UNORDERED_HAVE_PIECEWISE_CONSTRUCT
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#include <utility>
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#endif
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namespace boost {
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namespace unordered {
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#if BOOST_UNORDERED_HAVE_PIECEWISE_CONSTRUCT
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using std::piecewise_construct_t;
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using std::piecewise_construct;
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#else
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struct piecewise_construct_t
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{
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};
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const piecewise_construct_t piecewise_construct = piecewise_construct_t();
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#endif
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}
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}
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#endif
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