mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
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84 lines
2.7 KiB
C++
84 lines
2.7 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_RANGE_ADAPTOR_TAKEN_HPP
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#define SPROUT_RANGE_ADAPTOR_TAKEN_HPP
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#include <type_traits>
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#include <sprout/config.hpp>
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#include <sprout/container/traits.hpp>
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#include <sprout/container/functions.hpp>
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#include <sprout/iterator/next.hpp>
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#include <sprout/range/adaptor/detail/adapted_range_default.hpp>
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#include <sprout/type_traits/lvalue_reference.hpp>
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#include <sprout/utility/lvalue_forward.hpp>
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#include HDR_ALGORITHM_MIN_MAX_SSCRISK_CEL_OR_SPROUT
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namespace sprout {
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namespace adaptors {
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//
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// take_holder
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//
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template<typename Difference>
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class take_holder {
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public:
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typedef Difference difference_type;
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private:
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difference_type distance_;
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public:
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explicit SPROUT_CONSTEXPR take_holder(difference_type distance)
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: distance_(distance)
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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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// taken_forwarder
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//
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class taken_forwarder {
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public:
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template<typename Difference>
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SPROUT_CONSTEXPR sprout::adaptors::take_holder<Difference>
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operator()(Difference distance) const {
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return sprout::adaptors::take_holder<Difference>(distance);
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}
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};
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//
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// taken
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//
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namespace {
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SPROUT_STATIC_CONSTEXPR sprout::adaptors::taken_forwarder 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 Difference>
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inline SPROUT_CONSTEXPR sprout::adaptors::detail::adapted_range_default<
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typename std::remove_reference<typename sprout::lvalue_reference<Range>::type>::type
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>
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operator|(Range&& lhs, sprout::adaptors::take_holder<Difference> const& rhs) {
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typedef typename sprout::container_traits<
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typename std::remove_reference<typename sprout::lvalue_reference<Range>::type>::type
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>::difference_type difference_type;
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return sprout::adaptors::detail::adapted_range_default<
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typename std::remove_reference<typename sprout::lvalue_reference<Range>::type>::type
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>(
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sprout::begin(sprout::lvalue_forward<Range>(lhs)),
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sprout::next(
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sprout::begin(sprout::lvalue_forward<Range>(lhs)),
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NS_SSCRISK_CEL_OR_SPROUT::min<difference_type>(rhs.distance(), sprout::size(sprout::lvalue_forward<Range>(lhs)))
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)
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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_TAKEN_HPP
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