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75 lines
2 KiB
C++
75 lines
2 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2016 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_COMPOST_EFFECTS_RECTIFIED_HPP
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#define SPROUT_COMPOST_EFFECTS_RECTIFIED_HPP
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#include <sprout/config.hpp>
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#include <sprout/utility/forward.hpp>
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#include <sprout/range/adaptor/transformed.hpp>
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namespace sprout {
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namespace compost {
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//
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// rectify_value
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//
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template<typename T = void>
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struct rectify_value {
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public:
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typedef T argument_type;
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typedef T result_type;
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public:
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SPROUT_CONSTEXPR T
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operator()(T const& x) const {
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return x < 0 ? -x : x;
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}
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};
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template<>
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struct rectify_value<void> {
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public:
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template<typename T>
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SPROUT_CONSTEXPR T
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operator()(T const& x) const {
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return sprout::compost::rectify_value<T>()(x);
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}
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};
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namespace effects {
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//
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// rectified_forwarder
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//
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class rectified_forwarder {};
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//
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// rectified
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//
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namespace {
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SPROUT_STATIC_CONSTEXPR sprout::compost::effects::rectified_forwarder rectified = {};
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} // anonymous-namespace
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//
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// operator|
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//
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template<typename Range>
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inline SPROUT_CONSTEXPR auto
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operator|(Range&& lhs, sprout::compost::effects::rectified_forwarder const&)
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-> decltype(
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SPROUT_FORWARD(Range, lhs)
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| sprout::adaptors::transformed(sprout::compost::rectify_value<>())
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)
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{
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return SPROUT_FORWARD(Range, lhs)
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| sprout::adaptors::transformed(sprout::compost::rectify_value<>())
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;
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}
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} // namespace effects
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using sprout::compost::effects::rectified;
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} // namespace compost
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} // namespace sprout
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#endif // #ifndef SPROUT_COMPOST_EFFECTS_RECTIFIED_HPP
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