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37 lines
1,003 B
C++
37 lines
1,003 B
C++
/*=============================================================================
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Copyright (c) 2011-2015 Bolero MURAKAMI
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https://github.com/bolero-MURAKAMI/Sprout
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.sprout.org/LICENSE_1_0.txt)
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=============================================================================*/
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#ifndef SPROUT_UTILITY_USE_DEFAULT_HPP
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#define SPROUT_UTILITY_USE_DEFAULT_HPP
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#include <type_traits>
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#include <sprout/config.hpp>
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namespace sprout {
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//
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// use_default
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//
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struct use_default;
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//
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// is_use_default
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//
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template<typename T>
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struct is_use_default
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: public sprout::is_same<T, sprout::use_default>
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{};
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//
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// select_default
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//
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template<typename T, typename Default>
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struct select_default
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: public std::conditional<sprout::is_use_default<T>::value, Default, T>
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{};
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} // namespace sprout
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#endif // #ifndef SPROUT_UTILITY_USE_DEFAULT_HPP
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