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36 lines
959 B
C++
36 lines
959 B
C++
#ifndef SPROUT_WEED_OPERATOR_NEGATE_HPP
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#define SPROUT_WEED_OPERATOR_NEGATE_HPP
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#include <type_traits>
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#include <sprout/config.hpp>
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#include <sprout/utility/forward.hpp>
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#include <sprout/weed/expr/tag.hpp>
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#include <sprout/weed/expr/make_expr.hpp>
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#include <sprout/weed/traits/expr/expr_of.hpp>
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#include <sprout/weed/traits/parser/is_parser.hpp>
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namespace sprout {
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namespace weed {
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//
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// operator-
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//
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template<
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typename Arg,
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typename = typename std::enable_if<
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sprout::weed::traits::is_parser<
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typename std::remove_reference<Arg>::type
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>::value
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>::type
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>
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inline SPROUT_CONSTEXPR typename sprout::weed::traits::expr_of<
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sprout::weed::tag::negate,
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Arg
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>::type operator-(Arg&& arg) {
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return sprout::weed::make_expr<sprout::weed::tag::negate>(
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sprout::forward<Arg>(arg)
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);
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}
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} // namespace weed
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} // namespace sprout
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#endif // #ifndef SPROUT_WEED_OPERATOR_NEGATE_HPP
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