| 1 | |
|---|---|
| 2 | // Copyright (C) 2008-2016 Daniel James. |
| 3 | // Distributed under the Boost Software License, Version 1.0. (See accompanying |
| 4 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
| 5 | |
| 6 | #ifndef BOOST_UNORDERED_FWD_HPP_INCLUDED |
| 7 | #define BOOST_UNORDERED_FWD_HPP_INCLUDED |
| 8 | |
| 9 | #include <boost/config.hpp> |
| 10 | #if defined(BOOST_HAS_PRAGMA_ONCE) |
| 11 | #pragma once |
| 12 | #endif |
| 13 | |
| 14 | #include <boost/predef.h> |
| 15 | |
| 16 | #if defined(BOOST_UNORDERED_HAVE_PIECEWISE_CONSTRUCT) |
| 17 | // Already defined. |
| 18 | #elif defined(BOOST_LIBSTDCXX11) |
| 19 | // https://github.com/gcc-mirror/gcc/blob/gcc-4_6-branch/libstdc++-v3/include/bits/stl_pair.h#L70 |
| 20 | #if BOOST_LIBSTDCXX_VERSION > 40600 |
| 21 | #define BOOST_UNORDERED_HAVE_PIECEWISE_CONSTRUCT 1 |
| 22 | #endif |
| 23 | #elif BOOST_LIB_STD_CXX |
| 24 | // https://github.com/llvm-mirror/libcxx/blob/release_30/include/utility#L206 |
| 25 | #if BOOST_LIB_STD_CXX >= BOOST_VERSION_NUMBER(3, 0, 0) |
| 26 | #define BOOST_UNORDERED_HAVE_PIECEWISE_CONSTRUCT 1 |
| 27 | #endif |
| 28 | #elif defined(BOOST_LIB_STD_DINKUMWARE) |
| 29 | // Apparently C++11 standard supported in Visual Studio 2012 |
| 30 | // https://msdn.microsoft.com/en-us/library/hh567368.aspx#stl |
| 31 | // 2012 = VC+11 = BOOST_MSVC 1700 Hopefully! |
| 32 | // I have no idea when Dinkumware added it, probably a lot |
| 33 | // earlier than this check. |
| 34 | #if BOOST_LIB_STD_DINKUMWARE >= BOOST_VERSION_NUMBER(6, 50, 0) || \ |
| 35 | BOOST_COMP_MSVC >= BOOST_VERSION_NUMBER(17, 0, 0) |
| 36 | #define BOOST_UNORDERED_HAVE_PIECEWISE_CONSTRUCT 1 |
| 37 | #endif |
| 38 | #endif |
| 39 | |
| 40 | // Assume that an unknown library does not support piecewise construction. |
| 41 | #if !defined(BOOST_UNORDERED_HAVE_PIECEWISE_CONSTRUCT) |
| 42 | #define BOOST_UNORDERED_HAVE_PIECEWISE_CONSTRUCT 0 |
| 43 | #endif |
| 44 | |
| 45 | #if BOOST_UNORDERED_HAVE_PIECEWISE_CONSTRUCT |
| 46 | #include <utility> |
| 47 | #endif |
| 48 | |
| 49 | namespace boost { |
| 50 | namespace unordered { |
| 51 | #if BOOST_UNORDERED_HAVE_PIECEWISE_CONSTRUCT |
| 52 | using std::piecewise_construct_t; |
| 53 | using std::piecewise_construct; |
| 54 | #else |
| 55 | struct piecewise_construct_t |
| 56 | { |
| 57 | }; |
| 58 | const piecewise_construct_t piecewise_construct = piecewise_construct_t(); |
| 59 | #endif |
| 60 | } |
| 61 | } |
| 62 | |
| 63 | #endif |
| 64 |