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73 lines
2 KiB
C++
73 lines
2 KiB
C++
#ifndef SPROUT_COMPOST_EFFECTS_CHANGED_VOLUME_HPP
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#define SPROUT_COMPOST_EFFECTS_CHANGED_VOLUME_HPP
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#include <sprout/config.hpp>
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#include <sprout/functional/multiplies.hpp>
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#include <sprout/functional/bind2nd.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 effects {
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//
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// change_volume_holder
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//
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template<typename T>
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class change_volume_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 value_;
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public:
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change_volume_holder() = default;
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change_volume_holder(change_volume_holder const&) = default;
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explicit SPROUT_CONSTEXPR change_volume_holder(value_type const& value)
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: value_(value)
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{}
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SPROUT_CONSTEXPR value_type const& value() const {
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return value_;
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}
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};
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//
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// changed_volume_forwarder
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//
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class changed_volume_forwarder {
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public:
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template<typename T>
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SPROUT_CONSTEXPR sprout::compost::effects::change_volume_holder<T>
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operator()(T const& value) {
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return sprout::compost::effects::change_volume_holder<T>(value);
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}
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};
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//
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// changed_volume
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//
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namespace {
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SPROUT_STATIC_CONSTEXPR sprout::compost::effects::changed_volume_forwarder changed_volume = {};
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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::change_volume_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::bind2nd(sprout::multiplies<>(), rhs.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::bind2nd(sprout::multiplies<>(), rhs.value()))
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;
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}
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} // namespace effects
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using sprout::compost::effects::changed_volume;
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} // namespace compost
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} // namespace sprout
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#endif // #ifndef SPROUT_COMPOST_EFFECTS_CHANGED_VOLUME_HPP
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