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34 lines
838 B
C++
34 lines
838 B
C++
#ifndef SPROUT_WEED_ATTR_CNV_RESULT_OF_NEGATE_HPP
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#define SPROUT_WEED_ATTR_CNV_RESULT_OF_NEGATE_HPP
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#include <type_traits>
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#include <sprout/config.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 result_of {
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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:
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typedef sprout::weed::unused type;
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};
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} // namespace result_of
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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_RESULT_OF_NEGATE_HPP
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