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41 lines
1.2 KiB
C++
41 lines
1.2 KiB
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.boost.org/LICENSE_1_0.txt)
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=============================================================================*/
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#ifndef SPROUT_WEED_ATTR_CNV_RESULTS_NEGATE_HPP
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#define SPROUT_WEED_ATTR_CNV_RESULTS_NEGATE_HPP
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#include <type_traits>
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#include <sprout/config.hpp>
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#include <sprout/type_traits/identity.hpp>
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#include <sprout/weed/unused.hpp>
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#include <sprout/weed/traits/type/is_unused.hpp>
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namespace sprout {
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namespace weed {
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namespace attr_cnv {
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namespace results {
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//
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// negate
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//
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template<typename T, typename = void>
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struct negate;
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// -unused -> unused
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template<typename T>
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struct negate<
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T,
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typename std::enable_if<
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sprout::weed::traits::is_unused<T>::value
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>::type
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>
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: public sprout::identity<sprout::weed::unused>
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{};
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} // namespace results
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} // namespace attr_cnv
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} // namespace weed
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} // namespace sprout
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#endif // #ifndef SPROUT_WEED_ATTR_CNV_RESULTS_NEGATE_HPP
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