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https://github.com/bolero-MURAKAMI/Sprout.git
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130 lines
4 KiB
C++
130 lines
4 KiB
C++
#ifndef SPROUT_RANGE_ADAPTOR_ALTERNATED_HPP
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#define SPROUT_RANGE_ADAPTOR_ALTERNATED_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/iterator/alternate_iterator.hpp>
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#include <sprout/range/adaptor/detail/jointed_range_default.hpp>
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#include <sprout/type_traits/lvalue_reference.hpp>
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#include <sprout/utility/forward.hpp>
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#include <sprout/utility/lvalue_forward.hpp>
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#include <sprout/utility/value_holder/value_holder.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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// alternated_range
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//
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template<typename LRange, typename RRange>
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class alternated_range
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: public sprout::adaptors::detail::jointed_range_default<
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LRange, RRange,
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sprout::alternate_iterator<
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typename sprout::container_traits<LRange>::iterator,
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typename sprout::container_traits<RRange>::iterator
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>
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>
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{
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public:
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typedef sprout::adaptors::detail::jointed_range_default<
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LRange, RRange,
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sprout::alternate_iterator<
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typename sprout::container_traits<LRange>::iterator,
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typename sprout::container_traits<RRange>::iterator
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>
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> base_type;
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typedef typename base_type::range1_type range1_type;
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typedef typename base_type::range2_type range2_type;
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typedef typename base_type::iterator iterator;
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public:
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alternated_range() = default;
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alternated_range(alternated_range const&) = default;
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SPROUT_CONSTEXPR alternated_range(range1_type& range1, range2_type& range2)
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: base_type(
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iterator(sprout::begin(range1), sprout::begin(range2)),
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iterator(
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sprout::next(sprout::begin(range1), NS_SSCRISK_CEL_OR_SPROUT::min(sprout::size(range1), sprout::size(range2))),
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sprout::next(sprout::begin(range2), NS_SSCRISK_CEL_OR_SPROUT::min(sprout::size(range1), sprout::size(range2)))
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)
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)
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{}
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};
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//
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// alternate_holder
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//
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template<typename RRange>
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class alternate_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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alternate_holder() = default;
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alternate_holder(alternate_holder const&) = default;
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explicit SPROUT_CONSTEXPR alternate_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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// alternated_forwarder
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//
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class alternated_forwarder {
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public:
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template<typename RRange>
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SPROUT_CONSTEXPR sprout::adaptors::alternate_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) {
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return sprout::adaptors::alternate_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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// alternated
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//
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namespace {
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SPROUT_STATIC_CONSTEXPR sprout::adaptors::alternated_forwarder alternated = {};
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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 LRange, typename RRange>
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inline SPROUT_CONSTEXPR sprout::adaptors::alternated_range<
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typename std::remove_reference<typename sprout::lvalue_reference<LRange>::type>::type,
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RRange
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>
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operator|(LRange&& lhs, sprout::adaptors::alternate_holder<RRange> const& rhs) {
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return sprout::adaptors::alternated_range<
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typename std::remove_reference<typename sprout::lvalue_reference<LRange>::type>::type,
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RRange
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>(
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sprout::lvalue_forward<LRange>(lhs),
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rhs.range()
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);
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}
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} // namespace adaptors
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//
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// container_construct_traits
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//
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template<typename LRange, typename RRange>
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struct container_construct_traits<sprout::adaptors::alternated_range<LRange, RRange> >
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: public sprout::container_construct_traits<typename sprout::adaptors::alternated_range<LRange, RRange>::base_type>
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{};
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} // namespace sprout
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#endif // #ifndef SPROUT_RANGE_ADAPTOR_ALTERNATED_HPP
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