ceph/src/boost/boost/type_traits/add_reference.hpp

   1
   2 //  (C) Copyright Steve Cleary, Beman Dawes, Howard Hinnant & John Maddock 2000.
   3 //  Use, modification and distribution are subject to the Boost Software License,
   4 //  Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
   5 //  http://www.boost.org/LICENSE_1_0.txt).
   6 //
   7 //  See http://www.boost.org/libs/type_traits for most recent version including documentation.
   8
   9 #ifndef BOOST_TT_ADD_REFERENCE_HPP_INCLUDED
  10 #define BOOST_TT_ADD_REFERENCE_HPP_INCLUDED
  11
  12 #include <boost/detail/workaround.hpp>
  13 #include <boost/config.hpp>
  14
  15 namespace boost {
  16
  17 namespace detail {
  18
  19 //
  20 // We can't filter out rvalue_references at the same level as
  21 // references or we get ambiguities from msvc:
  22 //
  23
  24 template <typename T>
  25 struct add_reference_impl
  26 {
  27     typedef T& type;
  28 };
  29
  30 #ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
  31 template <typename T>
  32 struct add_reference_impl<T&&>
  33 {
  34     typedef T&& type;
  35 };
  36 #endif
  37
  38 } // namespace detail
  39
  40 template <class T> struct add_reference
  41 {
  42    typedef typename boost::detail::add_reference_impl<T>::type type;
  43 };
  44 template <class T> struct add_reference<T&>
  45 {
  46    typedef T& type;
  47 };
  48
  49 // these full specialisations are always required:
  50 template <> struct add_reference<void> { typedef void type; };
  51 #ifndef BOOST_NO_CV_VOID_SPECIALIZATIONS
  52 template <> struct add_reference<const void> { typedef const void type; };
  53 template <> struct add_reference<const volatile void> { typedef const volatile void type; };
  54 template <> struct add_reference<volatile void> { typedef volatile void type; };
  55 #endif
  56
  57 #if !defined(BOOST_NO_CXX11_TEMPLATE_ALIASES)
  58
  59 template <class T> using add_reference_t = typename add_reference<T>::type;
  60
  61 #endif
  62
  63
  64 } // namespace boost
  65
  66 #endif // BOOST_TT_ADD_REFERENCE_HPP_INCLUDED