ceph/src/boost/boost/histogram/detail/replace_type.hpp

   1 // Copyright 2019 Hans Dembinski
   2 //
   3 // Distributed under the Boost Software License, Version 1.0.
   4 // (See accompanying file LICENSE_1_0.txt
   5 // or copy at http://www.boost.org/LICENSE_1_0.txt)
   6
   7 #ifndef BOOST_HISTOGRAM_DETAIL_REPLACE_TYPE_HPP
   8 #define BOOST_HISTOGRAM_DETAIL_REPLACE_TYPE_HPP
   9
  10 #include <boost/core/use_default.hpp>
  11 #include <string>
  12 #include <type_traits>
  13
  14 namespace boost {
  15 namespace histogram {
  16 namespace detail {
  17
  18 template <class T, class From, class To>
  19 using replace_type = std::conditional_t<std::is_same<T, From>::value, To, T>;
  20
  21 template <class T, class Default>
  22 using replace_default = replace_type<T, boost::use_default, Default>;
  23
  24 template <class T>
  25 using replace_cstring = replace_type<T, const char*, std::string>;
  26
  27 } // namespace detail
  28 } // namespace histogram
  29 } // namespace boost
  30
  31 #endif