mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
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94 lines
2.7 KiB
C++
94 lines
2.7 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2018 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_CLIPPED_HPP
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#define SPROUT_COMPOST_EFFECTS_CLIPPED_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/clamped.hpp>
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namespace sprout {
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namespace compost {
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namespace effects {
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//
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// clip_holder
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//
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template<typename T>
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class clip_holder {
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public:
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typedef T value_type;
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private:
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value_type low_;
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value_type up_;
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public:
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SPROUT_CONSTEXPR clip_holder() SPROUT_DEFAULTED_DEFAULT_CONSTRUCTOR_DECL
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clip_holder(clip_holder const&) = default;
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explicit SPROUT_CONSTEXPR clip_holder(value_type const& low = -1, value_type const& up = 1)
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: low_(low), up_(up)
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{}
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SPROUT_CONSTEXPR value_type const& lower() const {
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return low_;
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}
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SPROUT_CONSTEXPR value_type const& upper() const {
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return up_;
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}
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};
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//
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// clipped_forwarder
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//
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class clipped_forwarder {
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public:
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template<typename T = double>
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SPROUT_CONSTEXPR sprout::compost::effects::clip_holder<T>
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operator()(T const& low = -1, T const& up = 1) const {
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return sprout::compost::effects::clip_holder<T>(low, up);
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}
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};
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//
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// clipped
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//
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namespace {
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SPROUT_STATIC_CONSTEXPR sprout::compost::effects::clipped_forwarder clipped = {};
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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, typename T>
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inline SPROUT_CONSTEXPR auto
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operator|(Range&& lhs, sprout::compost::effects::clip_holder<T> const& rhs)
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-> decltype(
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SPROUT_FORWARD(Range, lhs)
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| sprout::adaptors::clamped(rhs.lower(), rhs.upper())
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)
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{
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return SPROUT_FORWARD(Range, lhs)
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| sprout::adaptors::clamped(rhs.lower(), rhs.upper())
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;
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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::clipped_forwarder const&)
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-> decltype(
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SPROUT_FORWARD(Range, lhs)
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| sprout::adaptors::clamped(-1., 1.)
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)
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{
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return SPROUT_FORWARD(Range, lhs)
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| sprout::adaptors::clamped(-1., 1.)
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;
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}
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} // namespace effects
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using sprout::compost::effects::clipped;
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} // namespace compost
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} // namespace sprout
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#endif // #ifndef SPROUT_COMPOST_EFFECTS_CLIPPED_HPP
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