ceph/src/boost/boost/unordered/detail/fwd.hpp

   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 #if defined(BOOST_UNORDERED_HAVE_PIECEWISE_CONSTRUCT)
  15 // Already defined.
  16 #elif defined(BOOST_LIBSTDCXX11)
  17 // https://github.com/gcc-mirror/gcc/blob/gcc-4_6-branch/libstdc++-v3/include/bits/stl_pair.h#L70
  18 #if BOOST_LIBSTDCXX_VERSION > 40600
  19 #define BOOST_UNORDERED_HAVE_PIECEWISE_CONSTRUCT 1
  20 #endif
  21 #elif defined(_LIBCPP_VERSION)
  22 // https://github.com/llvm-mirror/libcxx/blob/release_30/include/utility#L206
  23 #if _LIBCPP_VERSION >= 3000
  24 #define BOOST_UNORDERED_HAVE_PIECEWISE_CONSTRUCT 1
  25 #endif
  26 #elif defined(BOOST_MSVC)
  27 // Apparently C++11 standard supported in Visual Studio 2012
  28 // https://msdn.microsoft.com/en-us/library/hh567368.aspx#stl
  29 // 2012 = VC+11 = BOOST_MSVC 1700 Hopefully!
  30 #if BOOST_MSVC >= 1700
  31 #define BOOST_UNORDERED_HAVE_PIECEWISE_CONSTRUCT 1
  32 #endif
  33 #endif
  34
  35 // Assume that an unknown library does not support piecewise construction.
  36 #if !defined(BOOST_UNORDERED_HAVE_PIECEWISE_CONSTRUCT)
  37 #define BOOST_UNORDERED_HAVE_PIECEWISE_CONSTRUCT 0
  38 #endif
  39
  40 #if BOOST_UNORDERED_HAVE_PIECEWISE_CONSTRUCT
  41 #include <utility>
  42 #endif
  43
  44 namespace boost {
  45   namespace unordered {
  46 #if BOOST_UNORDERED_HAVE_PIECEWISE_CONSTRUCT
  47     using std::piecewise_construct_t;
  48     using std::piecewise_construct;
  49 #else
  50     struct piecewise_construct_t
  51     {
  52     };
  53     const piecewise_construct_t piecewise_construct = piecewise_construct_t();
  54 #endif
  55   }
  56 }
  57
  58 #endif