Sprout/sprout/range/adaptor/indexed.hpp

#ifndef SPROUT_RANGE_ADAPTOR_INDEXED_HPP
#define SPROUT_RANGE_ADAPTOR_INDEXED_HPP

#include <type_traits>
#include <sprout/config.hpp>
#include <sprout/pit.hpp>
#include <sprout/container/traits.hpp>
#include <sprout/container/functions.hpp>
#include <sprout/iterator/indexed_iterator.hpp>
#include <sprout/range/range_container.hpp>
#include <sprout/range/algorithm/copy.hpp>
#include <sprout/type_traits/lvalue_reference.hpp>
#include <sprout/utility/forward.hpp>
#include <sprout/utility/lvalue_forward.hpp>

namespace sprout {
	namespace adaptors {
		//
		// indexed_range
		//
		template<typename Range>
		class indexed_range
			: public sprout::range::range_container<
				sprout::indexed_iterator<typename sprout::container_traits<Range>::iterator>
			>
			, public sprout::detail::container_nosy_static_size<Range>
			, public sprout::detail::container_nosy_fixed_size<Range>
		{
		public:
			typedef Range range_type;
			typedef sprout::range::range_container<
				sprout::indexed_iterator<typename sprout::container_traits<Range>::iterator>
			> base_type;
			typedef typename base_type::iterator iterator;
			typedef typename base_type::value_type value_type;
			typedef typename iterator::index_type index_type;
		public:
			indexed_range() = default;
			indexed_range(indexed_range const&) = default;
			explicit SPROUT_CONSTEXPR indexed_range(range_type& range)
				: base_type(
					iterator(sprout::begin(range)),
					iterator(sprout::end(range))
					)
			{}
			SPROUT_CONSTEXPR indexed_range(index_type index, range_type& range)
				: base_type(
					iterator(sprout::begin(range), index),
					iterator(sprout::end(range), index)
					)
			{}
		};

		//
		// indexed_holder
		//
		template<typename Index>
		class indexed_holder {
		public:
			typedef Index index_type;
		private:
			index_type index_;
		public:
			indexed_holder() = default;
			indexed_holder(indexed_holder const&) = default;
			SPROUT_CONSTEXPR indexed_holder(index_type index)
				: index_(index)
			{}
			SPROUT_CONSTEXPR index_type index() const {
				return index_;
			}
		};

		//
		// indexed_forwarder
		//
		class indexed_forwarder {
		public:
			template<typename Index>
			SPROUT_CONSTEXPR sprout::adaptors::indexed_holder<Index>
			operator()(Index index) {
				return sprout::adaptors::indexed_holder<Index>(index);
			}
		};

		//
		// indexed
		//
		namespace {
			SPROUT_STATIC_CONSTEXPR sprout::adaptors::indexed_forwarder indexed{};
		}	// anonymous-namespace

		//
		// operator|
		//
		template<typename Range>
		inline SPROUT_CONSTEXPR sprout::adaptors::indexed_range<
			typename std::remove_reference<typename sprout::lvalue_reference<Range>::type>::type
		>
		operator|(Range&& lhs, sprout::adaptors::indexed_forwarder const& rhs) {
			return sprout::adaptors::indexed_range<
				typename std::remove_reference<typename sprout::lvalue_reference<Range>::type>::type
			>(
				sprout::lvalue_forward<Range>(lhs)
				);
		}
		template<typename Range, typename Index>
		inline SPROUT_CONSTEXPR sprout::adaptors::indexed_range<
			typename std::remove_reference<typename sprout::lvalue_reference<Range>::type>::type
		>
		operator|(Range&& lhs, sprout::adaptors::indexed_holder<Index> const& rhs) {
			return sprout::adaptors::indexed_range<
				typename std::remove_reference<typename sprout::lvalue_reference<Range>::type>::type
			>(
				rhs.index(),
				sprout::lvalue_forward<Range>(lhs)
				);
		}
	}	// namespace adaptors

	//
	// container_construct_traits
	//
	template<typename Range>
	struct container_construct_traits<sprout::adaptors::indexed_range<Range> > {
	public:
		typedef typename sprout::container_construct_traits<Range>::copied_type copied_type;
	public:
		template<typename Cont>
		static SPROUT_CONSTEXPR copied_type deep_copy(Cont&& cont) {
			return sprout::range::fixed::copy(sprout::forward<Cont>(cont), sprout::pit<copied_type>());
		}
		template<typename... Args>
		static SPROUT_CONSTEXPR copied_type make(Args&&... args) {
			return sprout::make<copied_type>(sprout::forward<Args>(args)...);
		}
		template<typename Cont, typename... Args>
		static SPROUT_CONSTEXPR copied_type remake(
			Cont&& cont,
			typename sprout::container_traits<sprout::adaptors::indexed_range<Range> >::difference_type size,
			Args&&... args
			)
		{
			return sprout::remake<copied_type>(sprout::forward<Cont>(cont), size, sprout::forward<Args>(args)...);
		}
	};
}	// namespace sprout

#endif	// #ifndef SPROUT_RANGE_ADAPTOR_INDEXED_HPP