mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
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88 lines
2.7 KiB
C++
88 lines
2.7 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2017 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_SUPERPOSED_HPP
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#define SPROUT_COMPOST_EFFECTS_SUPERPOSED_HPP
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#include <sprout/config.hpp>
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#include <sprout/functional/plus.hpp>
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#include <sprout/utility/forward.hpp>
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#include <sprout/utility/value_holder/value_holder.hpp>
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#include <sprout/utility/lvalue_forward.hpp>
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#include <sprout/type_traits/lvalue_reference.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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// superpose_holder
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//
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template<typename RRange>
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class superpose_holder {
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public:
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typedef RRange range2_type;
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private:
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sprout::value_holder<range2_type&> range_;
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public:
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SPROUT_CONSTEXPR superpose_holder() SPROUT_DEFAULTED_DEFAULT_CONSTRUCTOR_DECL
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superpose_holder(superpose_holder const&) = default;
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explicit SPROUT_CONSTEXPR superpose_holder(range2_type& range)
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: range_(range)
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{}
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SPROUT_CONSTEXPR range2_type& range() const {
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return range_;
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}
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};
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//
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// superposed_forwarder
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//
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class superposed_forwarder {
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public:
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template<typename RRange>
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SPROUT_CONSTEXPR sprout::compost::effects::superpose_holder<
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typename std::remove_reference<typename sprout::lvalue_reference<RRange>::type>::type
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>
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operator()(RRange&& range) const {
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return sprout::compost::effects::superpose_holder<
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typename std::remove_reference<typename sprout::lvalue_reference<RRange>::type>::type
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>(
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sprout::lvalue_forward<RRange>(range)
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);
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}
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};
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//
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// superposed
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//
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namespace {
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SPROUT_STATIC_CONSTEXPR sprout::compost::effects::superposed_forwarder superposed = {};
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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::superpose_holder<T> const& rhs)
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-> decltype(
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SPROUT_FORWARD(Range, lhs)
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| sprout::adaptors::transformed(rhs.range(), sprout::plus<>())
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)
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{
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return SPROUT_FORWARD(Range, lhs)
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| sprout::adaptors::transformed(rhs.range(), sprout::plus<>())
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;
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}
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} // namespace effects
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using sprout::compost::effects::superposed;
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} // namespace compost
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} // namespace sprout
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#endif // #ifndef SPROUT_COMPOST_EFFECTS_SUPERPOSED_HPP
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