Sprout/sprout/range/adaptor/clamped.hpp

#ifndef SPROUT_RANGE_ADAPTOR_CLAMPED_HPP
#define SPROUT_RANGE_ADAPTOR_CLAMPED_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/clamp_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>
#include HDR_FUNCTIONAL_SSCRISK_CEL_OR_SPROUT

namespace sprout {
	namespace adaptors {
		//
		// clamped_range
		//
		template<
			typename Range,
			typename Compare = NS_SSCRISK_CEL_OR_SPROUT::less<typename sprout::container_traits<Range>::value_type>
		>
		class clamped_range
			: public sprout::range::range_container<
				sprout::clamp_iterator<typename sprout::container_traits<Range>::iterator, Compare>
			>
			, 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::clamp_iterator<typename sprout::container_traits<Range>::iterator, Compare>
			> base_type;
			typedef typename base_type::iterator iterator;
			typedef typename base_type::value_type value_type;
			typedef typename iterator::compare_type compare_type;
		public:
			clamped_range() = default;
			clamped_range(clamped_range const&) = default;
			explicit SPROUT_CONSTEXPR clamped_range(
				range_type& range,
				value_type const& low,
				value_type const& up,
				compare_type comp = compare_type()
				)
				: base_type(
					iterator(sprout::begin(range), low, up, comp),
					iterator(sprout::end(range), low, up, comp)
					)
			{}
			SPROUT_CONSTEXPR compare_type compare() const {
				return base_type::begin().compare();
			}
			SPROUT_CONSTEXPR value_type lower() const {
				return base_type::begin().lower();
			}
			SPROUT_CONSTEXPR value_type upper() const {
				return base_type::begin().upper();
			}
		};

		//
		// clamp_holder
		//
		template<typename Value, typename Compare = NS_SSCRISK_CEL_OR_SPROUT::less<Value> >
		class clamp_holder {
		public:
			typedef Value value_type;
			typedef Compare compare_type;
		private:
			compare_type comp_;
			value_type low_;
			value_type up_;
		public:
			SPROUT_CONSTEXPR clamp_holder(value_type const& low, value_type const& up, compare_type comp = compare_type())
				: comp_(comp), low_(low), up_(up)
			{}
			SPROUT_CONSTEXPR compare_type const& compare() const {
				return comp_;
			}
			SPROUT_CONSTEXPR value_type const& lower() const {
				return low_;
			}
			SPROUT_CONSTEXPR value_type const& upper() const {
				return up_;
			}
		};

		//
		// clamped_forwarder
		//
		class clamped_forwarder {
		public:
			template<typename Value, typename Compare>
			SPROUT_CONSTEXPR sprout::adaptors::clamp_holder<Value, Compare>
			operator()(Value const& low, Value const& up, Compare comp) {
				return sprout::adaptors::clamp_holder<Value, Compare>(low, up, comp);
			}
			template<typename Value>
			SPROUT_CONSTEXPR sprout::adaptors::clamp_holder<Value>
			operator()(Value const& low, Value const& up) {
				return sprout::adaptors::clamp_holder<Value>(low, up);
			}
		};

		//
		// clamped
		//
		namespace {
			SPROUT_STATIC_CONSTEXPR sprout::adaptors::clamped_forwarder clamped{};
		}	// anonymous-namespace

		//
		// operator|
		//
		template<typename Range, typename Value, typename Compare>
		inline SPROUT_CONSTEXPR sprout::adaptors::clamped_range<
			typename std::remove_reference<typename sprout::lvalue_reference<Range>::type>::type,
			Compare
		>
		operator|(Range&& lhs, sprout::adaptors::clamp_holder<Value, Compare> const& rhs) {
			return sprout::adaptors::clamped_range<
				typename std::remove_reference<typename sprout::lvalue_reference<Range>::type>::type,
				Compare
			>(
				sprout::lvalue_forward<Range>(lhs),
				rhs.lower(), rhs.upper(), rhs.compare()
				);
		}
	}	// namespace adaptors

	//
	// container_construct_traits
	//
	template<typename Range, typename Compare>
	struct container_construct_traits<sprout::adaptors::clamped_range<Range, Compare> > {
	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::clamped_range<Range, Compare> >::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_CLAMPED_HPP