| |
| // Copyright (C) 2008-2016 Daniel James. |
| // Distributed under the Boost Software License, Version 1.0. (See accompanying |
| // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
| |
| #ifndef BOOST_UNORDERED_FWD_HPP_INCLUDED |
| #define BOOST_UNORDERED_FWD_HPP_INCLUDED |
| |
| #include <boost/config.hpp> |
| #if defined(BOOST_HAS_PRAGMA_ONCE) |
| #pragma once |
| #endif |
| |
| #include <boost/predef.h> |
| |
| #if defined(BOOST_UNORDERED_HAVE_PIECEWISE_CONSTRUCT) |
| // Already defined. |
| #elif defined(BOOST_LIBSTDCXX11) |
| // https://github.com/gcc-mirror/gcc/blob/gcc-4_6-branch/libstdc++-v3/include/bits/stl_pair.h#L70 |
| #if BOOST_LIBSTDCXX_VERSION > 40600 |
| #define BOOST_UNORDERED_HAVE_PIECEWISE_CONSTRUCT 1 |
| #endif |
| #elif BOOST_LIB_STD_CXX |
| // https://github.com/llvm-mirror/libcxx/blob/release_30/include/utility#L206 |
| #if BOOST_LIB_STD_CXX >= BOOST_VERSION_NUMBER(3, 0, 0) |
| #define BOOST_UNORDERED_HAVE_PIECEWISE_CONSTRUCT 1 |
| #endif |
| #elif defined(BOOST_LIB_STD_DINKUMWARE) |
| // Apparently C++11 standard supported in Visual Studio 2012 |
| // https://msdn.microsoft.com/en-us/library/hh567368.aspx#stl |
| // 2012 = VC+11 = BOOST_MSVC 1700 Hopefully! |
| // I have no idea when Dinkumware added it, probably a lot |
| // earlier than this check. |
| #if BOOST_LIB_STD_DINKUMWARE >= BOOST_VERSION_NUMBER(6, 50, 0) || \ |
| BOOST_COMP_MSVC >= BOOST_VERSION_NUMBER(17, 0, 0) |
| #define BOOST_UNORDERED_HAVE_PIECEWISE_CONSTRUCT 1 |
| #endif |
| #endif |
| |
| // Assume that an unknown library does not support piecewise construction. |
| #if !defined(BOOST_UNORDERED_HAVE_PIECEWISE_CONSTRUCT) |
| #define BOOST_UNORDERED_HAVE_PIECEWISE_CONSTRUCT 0 |
| #endif |
| |
| #if BOOST_UNORDERED_HAVE_PIECEWISE_CONSTRUCT |
| #include <utility> |
| #endif |
| |
| namespace boost { |
| namespace unordered { |
| #if BOOST_UNORDERED_HAVE_PIECEWISE_CONSTRUCT |
| using std::piecewise_construct_t; |
| using std::piecewise_construct; |
| #else |
| struct piecewise_construct_t |
| { |
| }; |
| const piecewise_construct_t piecewise_construct = piecewise_construct_t(); |
| #endif |
| } |
| } |
| |
| #endif |