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 32