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79 lines
2.7 KiB
C++
79 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_RANGE_ADAPTOR_ADAPTED_TAKEN_HPP
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#define SPROUT_RANGE_ADAPTOR_ADAPTED_TAKEN_HPP
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#include <sprout/config.hpp>
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#include <sprout/utility/lvalue_forward.hpp>
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#include <sprout/range/adaptor/taken.hpp>
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#include <sprout/range/adaptor/dropped.hpp>
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#include <sprout/range/adaptor/jointed.hpp>
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namespace sprout {
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namespace adaptors {
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//
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// adapt_take_holder
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//
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template<typename Adaptor, typename Difference>
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class adapt_take_holder {
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public:
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typedef Adaptor adaptor_type;
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typedef Difference difference_type;
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private:
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adaptor_type adaptor_;
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difference_type distance_;
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public:
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SPROUT_CONSTEXPR adapt_take_holder(adaptor_type const& adaptor, difference_type distance)
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: adaptor_(adaptor), distance_(distance)
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{}
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SPROUT_CONSTEXPR adaptor_type const& adaptor() const {
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return adaptor_;
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}
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SPROUT_CONSTEXPR difference_type const& distance() const {
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return distance_;
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}
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};
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//
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// adapted_taken_forwarder
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//
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class adapted_taken_forwarder {
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public:
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template<typename Adaptor, typename Difference>
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SPROUT_CONSTEXPR sprout::adaptors::adapt_take_holder<Adaptor, Difference>
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operator()(Adaptor const& adaptor, Difference distance) const {
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return sprout::adaptors::adapt_take_holder<Adaptor, Difference>(adaptor, distance);
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}
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};
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//
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// adapted_taken
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//
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namespace {
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SPROUT_STATIC_CONSTEXPR sprout::adaptors::adapted_taken_forwarder adapted_taken = {};
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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 Adaptor, typename Difference>
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inline SPROUT_CONSTEXPR auto
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operator|(Range&& lhs, sprout::adaptors::adapt_take_holder<Adaptor, Difference> const& rhs)
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-> decltype(
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sprout::lvalue_forward<Range>(lhs) | sprout::adaptors::taken(rhs.distance()) | rhs.adaptor()
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| sprout::adaptors::jointed(sprout::lvalue_forward<Range>(lhs) | sprout::adaptors::dropped(rhs.distance()))
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)
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{
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return sprout::lvalue_forward<Range>(lhs) | sprout::adaptors::taken(rhs.distance()) | rhs.adaptor()
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| sprout::adaptors::jointed(sprout::lvalue_forward<Range>(lhs) | sprout::adaptors::dropped(rhs.distance()))
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;
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}
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} // namespace adaptors
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} // namespace sprout
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#endif // #ifndef SPROUT_RANGE_ADAPTOR_ADAPTED_TAKEN_HPP
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