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fix tuple_element: support SFINAE-friendly

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bolero-MURAKAMI 2014-05-29 00:25:37 +09:00
parent f42e92b448
commit c15de6136b
64 changed files with 984 additions and 113 deletions
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37
sprout/utility/use_default.hpp Normal file
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/*=============================================================================
Copyright (c) 2011-2014 Bolero MURAKAMI
https://github.com/bolero-MURAKAMI/Sprout
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at http://www.sprout.org/LICENSE_1_0.txt)
=============================================================================*/
#ifndef SPROUT_UTILITY_USE_DEFAULT_HPP
#define SPROUT_UTILITY_USE_DEFAULT_HPP
#include <type_traits>
#include <sprout/config.hpp>
namespace sprout {
//
// use_default
//
struct use_default;
//
// is_use_default
//
template<typename T>
struct is_use_default
: public sprout::is_same<T, sprout::use_default>
{};
//
// select_default
//
template<typename T, typename Default>
struct select_default
: public std::conditional<sprout::is_use_default<T>::value, Default, T>
{};
} // namespace sprout
#endif // #ifndef SPROUT_UTILITY_USE_DEFAULT_HPP