mirror of
https://github.com/bolero-MURAKAMI/Sprout
synced 2024-11-12 21:09:01 +00:00
77 lines
2.3 KiB
C++
77 lines
2.3 KiB
C++
#ifndef SPROUT_RANGE_ADAPTOR_TAKEN_HPP
|
|
#define SPROUT_RANGE_ADAPTOR_TAKEN_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/range_container.hpp>
|
|
#include <sprout/type_traits/lvalue_reference.hpp>
|
|
#include <sprout/utility/lvalue_forward.hpp>
|
|
#include HDR_ALGORITHM_SSCRISK_CEL_OR_SPROUT
|
|
|
|
namespace sprout {
|
|
namespace adaptors {
|
|
//
|
|
// take_holder
|
|
//
|
|
template<typename Difference>
|
|
class take_holder {
|
|
public:
|
|
typedef Difference difference_type;
|
|
private:
|
|
difference_type distance_;
|
|
public:
|
|
explicit SPROUT_CONSTEXPR take_holder(difference_type distance)
|
|
: distance_(distance)
|
|
{}
|
|
SPROUT_CONSTEXPR difference_type const& distance() const {
|
|
return distance_;
|
|
}
|
|
};
|
|
|
|
//
|
|
// taken_forwarder
|
|
//
|
|
class taken_forwarder {
|
|
public:
|
|
template<typename Difference>
|
|
SPROUT_CONSTEXPR sprout::adaptors::take_holder<Difference>
|
|
operator()(Difference distance) {
|
|
return sprout::adaptors::take_holder<Difference>(distance);
|
|
}
|
|
};
|
|
|
|
//
|
|
// taken
|
|
//
|
|
namespace {
|
|
SPROUT_STATIC_CONSTEXPR sprout::adaptors::taken_forwarder taken{};
|
|
} // anonymous-namespace
|
|
|
|
//
|
|
// operator|
|
|
//
|
|
template<typename Range, typename Difference>
|
|
inline SPROUT_CONSTEXPR sprout::range::range_container<
|
|
typename sprout::container_traits<typename std::remove_reference<typename sprout::lvalue_reference<Range>::type>::type>::iterator
|
|
>
|
|
operator|(Range&& lhs, sprout::adaptors::take_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::range::range_container<
|
|
typename sprout::container_traits<typename std::remove_reference<typename sprout::lvalue_reference<Range>::type>::type>::iterator
|
|
>(
|
|
sprout::begin(sprout::lvalue_forward<Range>(lhs)),
|
|
sprout::next(
|
|
sprout::begin(sprout::lvalue_forward<Range>(lhs)),
|
|
NS_SSCRISK_CEL_OR_SPROUT::min<difference_type>(rhs.distance(), sprout::size(sprout::lvalue_forward<Range>(lhs)))
|
|
)
|
|
);
|
|
}
|
|
} // namespace adaptors
|
|
} // namespace sprout
|
|
|
|
#endif // #ifndef SPROUT_RANGE_ADAPTOR_TAKEN_HPP
|