mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
synced 2024-11-25 00:43:44 +00:00
84 lines
2.8 KiB
C++
84 lines
2.8 KiB
C++
/*=============================================================================
|
|
Copyright (c) 2011-2015 Bolero MURAKAMI
|
|
https://github.com/bolero-MURAKAMI/Sprout
|
|
|
|
Distributed under the Boost Software License, Version 1.0. (See accompanying
|
|
file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
|
|
=============================================================================*/
|
|
#ifndef SPROUT_RANGE_ADAPTOR_DROPPED_END_HPP
|
|
#define SPROUT_RANGE_ADAPTOR_DROPPED_END_HPP
|
|
|
|
#include <type_traits>
|
|
#include <sprout/config.hpp>
|
|
#include <sprout/container/traits.hpp>
|
|
#include <sprout/container/functions.hpp>
|
|
#include <sprout/iterator/next.hpp>
|
|
#include <sprout/range/adaptor/detail/adapted_range_default.hpp>
|
|
#include <sprout/type_traits/lvalue_reference.hpp>
|
|
#include <sprout/utility/lvalue_forward.hpp>
|
|
#include HDR_ALGORITHM_MIN_MAX_SSCRISK_CEL_OR_SPROUT
|
|
|
|
namespace sprout {
|
|
namespace adaptors {
|
|
//
|
|
// drop_end_holder
|
|
//
|
|
template<typename Difference>
|
|
class drop_end_holder {
|
|
public:
|
|
typedef Difference difference_type;
|
|
private:
|
|
difference_type distance_;
|
|
public:
|
|
explicit SPROUT_CONSTEXPR drop_end_holder(difference_type distance)
|
|
: distance_(distance)
|
|
{}
|
|
SPROUT_CONSTEXPR difference_type const& distance() const {
|
|
return distance_;
|
|
}
|
|
};
|
|
|
|
//
|
|
// dropped_end_forwarder
|
|
//
|
|
class dropped_end_forwarder {
|
|
public:
|
|
template<typename Difference>
|
|
SPROUT_CONSTEXPR sprout::adaptors::drop_end_holder<Difference>
|
|
operator()(Difference distance) const {
|
|
return sprout::adaptors::drop_end_holder<Difference>(distance);
|
|
}
|
|
};
|
|
|
|
//
|
|
// dropped_end
|
|
//
|
|
namespace {
|
|
SPROUT_STATIC_CONSTEXPR sprout::adaptors::dropped_end_forwarder dropped_end = {};
|
|
} // anonymous-namespace
|
|
|
|
//
|
|
// operator|
|
|
//
|
|
template<typename Range, typename Difference>
|
|
inline SPROUT_CONSTEXPR sprout::adaptors::detail::adapted_range_default<
|
|
typename std::remove_reference<typename sprout::lvalue_reference<Range>::type>::type
|
|
>
|
|
operator|(Range&& lhs, sprout::adaptors::drop_end_holder<Difference> const& rhs) {
|
|
typedef typename sprout::container_traits<
|
|
typename std::remove_reference<typename sprout::lvalue_reference<Range>::type>::type
|
|
>::difference_type difference_type;
|
|
return sprout::adaptors::detail::adapted_range_default<
|
|
typename std::remove_reference<typename sprout::lvalue_reference<Range>::type>::type
|
|
>(
|
|
sprout::begin(sprout::lvalue_forward<Range>(lhs)),
|
|
sprout::next(
|
|
sprout::end(sprout::lvalue_forward<Range>(lhs)),
|
|
NS_SSCRISK_CEL_OR_SPROUT::max<difference_type>(rhs.distance(), -sprout::size(sprout::lvalue_forward<Range>(lhs)))
|
|
)
|
|
);
|
|
}
|
|
} // namespace adaptors
|
|
} // namespace sprout
|
|
|
|
#endif // #ifndef SPROUT_RANGE_ADAPTOR_DROPPED_END_HPP
|