mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
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127 lines
3.7 KiB
C++
127 lines
3.7 KiB
C++
#ifndef SPROUT_RANGE_ADAPTOR_INDEXED_HPP
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#define SPROUT_RANGE_ADAPTOR_INDEXED_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/indexed_iterator.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/forward.hpp>
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#include <sprout/utility/lvalue_forward.hpp>
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namespace sprout {
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namespace adaptors {
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//
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// indexed_range
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//
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template<typename Range>
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class indexed_range
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: public sprout::adaptors::detail::adapted_range_default<
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Range,
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sprout::indexed_iterator<typename sprout::container_traits<Range>::iterator>
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>
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{
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public:
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typedef sprout::adaptors::detail::adapted_range_default<
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Range,
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sprout::indexed_iterator<typename sprout::container_traits<Range>::iterator>
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> base_type;
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typedef typename base_type::range_type range_type;
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typedef typename base_type::iterator iterator;
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typedef typename iterator::index_type index_type;
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public:
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indexed_range() = default;
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indexed_range(indexed_range const&) = default;
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explicit SPROUT_CONSTEXPR indexed_range(range_type& range)
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: base_type(
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iterator(sprout::begin(range)),
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iterator(sprout::end(range))
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)
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{}
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SPROUT_CONSTEXPR indexed_range(index_type index, range_type& range)
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: base_type(
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iterator(sprout::begin(range), index),
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iterator(sprout::end(range), index)
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)
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{}
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};
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//
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// indexed_holder
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//
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template<typename Index>
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class indexed_holder {
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public:
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typedef Index index_type;
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private:
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index_type index_;
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public:
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indexed_holder() = default;
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indexed_holder(indexed_holder const&) = default;
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explicit SPROUT_CONSTEXPR indexed_holder(index_type index)
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: index_(index)
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{}
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SPROUT_CONSTEXPR index_type const& index() const {
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return index_;
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}
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};
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//
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// indexed_forwarder
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//
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class indexed_forwarder {
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public:
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template<typename Index>
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SPROUT_CONSTEXPR sprout::adaptors::indexed_holder<Index>
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operator()(Index index) const {
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return sprout::adaptors::indexed_holder<Index>(index);
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}
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};
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//
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// indexed
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//
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namespace {
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SPROUT_STATIC_CONSTEXPR sprout::adaptors::indexed_forwarder indexed = {};
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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>
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inline SPROUT_CONSTEXPR sprout::adaptors::indexed_range<
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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::indexed_forwarder const& rhs) {
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return sprout::adaptors::indexed_range<
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typename std::remove_reference<typename sprout::lvalue_reference<Range>::type>::type
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>(
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sprout::lvalue_forward<Range>(lhs)
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);
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}
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template<typename Range, typename Index>
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inline SPROUT_CONSTEXPR sprout::adaptors::indexed_range<
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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::indexed_holder<Index> const& rhs) {
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return sprout::adaptors::indexed_range<
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typename std::remove_reference<typename sprout::lvalue_reference<Range>::type>::type
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>(
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rhs.index(),
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sprout::lvalue_forward<Range>(lhs)
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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 Range>
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struct container_construct_traits<sprout::adaptors::indexed_range<Range> >
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: public sprout::container_construct_traits<typename sprout::adaptors::indexed_range<Range>::base_type>
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{};
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} // namespace sprout
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#endif // #ifndef SPROUT_RANGE_ADAPTOR_INDEXED_HPP
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