3rdparty/boost/boost/type_traits/copy_cv.hpp

   1 #ifndef BOOST_TYPE_TRAITS_COPY_CV_HPP_INCLUDED
   2 #define BOOST_TYPE_TRAITS_COPY_CV_HPP_INCLUDED
   3
   4 //
   5 //  Copyright 2015 Peter Dimov
   6 //
   7 //  Distributed under the Boost Software License, Version 1.0.
   8 //  See accompanying file LICENSE_1_0.txt or copy at
   9 //  http://www.boost.org/LICENSE_1_0.txt
  10 //
  11
  12 #include <boost/type_traits/is_const.hpp>
  13 #include <boost/type_traits/is_volatile.hpp>
  14 #include <boost/type_traits/add_const.hpp>
  15 #include <boost/type_traits/add_volatile.hpp>
  16 #include <boost/type_traits/conditional.hpp>
  17
  18 namespace boost
  19 {
  20
  21 template<class T, class U> struct copy_cv
  22 {
  23 private:
  24
  25     typedef typename boost::conditional<boost::is_const<U>::value, typename boost::add_const<T>::type, T>::type CT;
  26
  27 public:
  28
  29     typedef typename boost::conditional<boost::is_volatile<U>::value, typename boost::add_volatile<CT>::type, CT>::type type;
  30 };
  31
  32 #if !defined(BOOST_NO_CXX11_TEMPLATE_ALIASES)
  33
  34    template <class T, class U> using copy_cv_t = typename copy_cv<T, U>::type;
  35
  36 #endif
  37
  38 } // namespace boost
  39
  40 #endif // #ifndef BOOST_TYPE_TRAITS_COPY_CV_HPP_INCLUDED