ceph/src/boost/boost/type_traits/copy_reference.hpp

   1 /*
   2 Copyright 2019 Glen Joseph Fernandes
   3 (glenjofe@gmail.com)
   4
   5 Distributed under the Boost Software License,
   6 Version 1.0. (See accompanying file LICENSE_1_0.txt
   7 or copy at http://www.boost.org/LICENSE_1_0.txt)
   8 */
   9 #ifndef BOOST_TT_COPY_REFERENCE_HPP_INCLUDED
  10 #define BOOST_TT_COPY_REFERENCE_HPP_INCLUDED
  11
  12 #include <boost/type_traits/add_lvalue_reference.hpp>
  13 #include <boost/type_traits/add_rvalue_reference.hpp>
  14 #include <boost/type_traits/is_lvalue_reference.hpp>
  15 #include <boost/type_traits/is_rvalue_reference.hpp>
  16 #include <boost/type_traits/conditional.hpp>
  17
  18 namespace boost {
  19
  20 template<class T, class U>
  21 struct copy_reference {
  22     typedef typename conditional<is_rvalue_reference<U>::value,
  23         typename add_rvalue_reference<T>::type,
  24         typename conditional<is_lvalue_reference<U>::value,
  25         typename add_lvalue_reference<T>::type, T>::type>::type type;
  26 };
  27
  28 #if !defined(BOOST_NO_CXX11_TEMPLATE_ALIASES)
  29 template<class T, class U>
  30 using copy_reference_t = typename copy_reference<T, U>::type;
  31 #endif
  32
  33 } /* boost */
  34
  35 #endif