mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
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125 lines
3.5 KiB
C++
125 lines
3.5 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2015 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_NOISE_GATED_HPP
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#define SPROUT_COMPOST_EFFECTS_NOISE_GATED_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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namespace detail {
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template<typename Value, typename T>
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SPROUT_CONSTEXPR T
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noise_gate_value(T const& x, Value const& threshold) {
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return x <= threshold && x >= -threshold ? 0
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: x
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;
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}
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} // namespace detail
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//
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// noise_gate_value
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//
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template<typename Value, typename T = void>
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struct noise_gate_value {
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public:
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typedef Value value_type;
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typedef T argument_type;
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typedef T result_type;
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private:
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value_type threshold_;
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public:
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explicit SPROUT_CONSTEXPR noise_gate_value(Value const& threshold)
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: threshold_(threshold)
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{}
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SPROUT_CONSTEXPR result_type
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operator()(T const& x) const {
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return sprout::compost::detail::noise_gate_value(x, threshold_);
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}
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};
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template<typename Value>
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struct noise_gate_value<Value, void> {
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public:
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typedef Value value_type;
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private:
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value_type threshold_;
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public:
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explicit SPROUT_CONSTEXPR noise_gate_value(Value const& threshold)
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: threshold_(threshold)
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{}
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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::detail::noise_gate_value(x, threshold_);
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}
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};
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namespace effects {
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//
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// noise_gate_holder
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//
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template<typename T>
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class noise_gate_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 threshold_;
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public:
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SPROUT_CONSTEXPR noise_gate_holder() SPROUT_DEFAULTED_DEFAULT_CONSTRUCTOR_DECL
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noise_gate_holder(noise_gate_holder const&) = default;
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explicit SPROUT_CONSTEXPR noise_gate_holder(value_type const& threshold)
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: threshold_(threshold)
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{}
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SPROUT_CONSTEXPR value_type const& threshold() const {
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return threshold_;
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}
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};
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//
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// noise_gated_forwarder
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//
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class noise_gated_forwarder {
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public:
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template<typename T>
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SPROUT_CONSTEXPR sprout::compost::effects::noise_gate_holder<T>
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operator()(T const& threshold) const {
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return sprout::compost::effects::noise_gate_holder<T>(threshold);
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}
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};
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//
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// noise_gated
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//
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namespace {
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SPROUT_STATIC_CONSTEXPR sprout::compost::effects::noise_gated_forwarder noise_gated = {};
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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::noise_gate_holder<T> const& rhs)
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-> decltype(
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SPROUT_FORWARD(Range, lhs)
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| sprout::adaptors::transformed(sprout::compost::noise_gate_value<T>(rhs.threshold()))
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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::noise_gate_value<T>(rhs.threshold()))
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;
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}
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} // namespace effects
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using sprout::compost::effects::noise_gated;
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} // namespace compost
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} // namespace sprout
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#endif // #ifndef SPROUT_COMPOST_EFFECTS_NOISE_GATED_HPP
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