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49 lines
1.5 KiB
C++
49 lines
1.5 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2014 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_OPERATOR_MINUS_HPP
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#define SPROUT_WEED_OPERATOR_MINUS_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 Arg1,
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typename Arg2,
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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<Arg1>::type
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>::value
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&& sprout::weed::traits::is_parser<
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typename std::remove_reference<Arg2>::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::minus,
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Arg1,
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Arg2
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>::type operator-(Arg1&& arg1, Arg2&& arg2) {
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return sprout::weed::make_expr<sprout::weed::tag::minus>(
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SPROUT_FORWARD(Arg1, arg1),
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SPROUT_FORWARD(Arg2, arg2)
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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_MINUS_HPP
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