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 #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