mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
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86 lines
2.9 KiB
C++
86 lines
2.9 KiB
C++
#ifndef SPROUT_OPERATION_FIXED_ERASE_N_HPP
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#define SPROUT_OPERATION_FIXED_ERASE_N_HPP
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#include <cstddef>
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#include <sprout/config.hpp>
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#include <sprout/index_tuple.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/operation.hpp>
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namespace sprout {
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namespace fixed {
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namespace result_of {
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//
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// erase_n
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//
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template<std::size_t N, typename Container>
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struct erase_n
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: public sprout::container_transform_traits<
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Container
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>::template rebind_size<
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sprout::container_traits<Container>::static_size - N
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>
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{
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static_assert(sprout::container_traits<Container>::static_size >= N, "static_size >= N");
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};
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} // namespace result_of
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namespace detail {
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template<std::size_t N, typename Result, typename Container, sprout::index_t... Indexes>
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inline SPROUT_CONSTEXPR Result
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erase_n_impl(
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Container const& cont, sprout::index_tuple<Indexes...>,
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typename sprout::container_traits<Container>::difference_type pos
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)
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{
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return sprout::remake<Result>(
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cont,
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sprout::size(cont) - N,
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(Indexes < sprout::container_traits<Container>::static_size - N
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? (Indexes < pos
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? *sprout::next(sprout::internal_begin(cont), Indexes)
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: *sprout::next(sprout::internal_begin(cont), Indexes + N)
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)
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: typename sprout::container_traits<Result>::value_type()
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)...
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);
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}
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} // namespace detail
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//
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// erase_n
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//
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template<std::size_t N, typename Container>
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inline SPROUT_CONSTEXPR typename sprout::fixed::result_of::erase_n<N, Container>::type
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erase_n(Container const& cont, typename sprout::container_traits<Container>::const_iterator pos) {
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return sprout::fixed::detail::erase_n_impl<N, typename sprout::fixed::result_of::erase_n<N, Container>::type>(
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cont,
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sprout::index_range<
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0,
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sprout::container_traits<typename sprout::fixed::result_of::erase_n<N, Container>::type>::static_size
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>::make(),
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sprout::distance(sprout::internal_begin(cont), pos)
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);
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}
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template<std::size_t N, typename Container>
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inline SPROUT_CONSTEXPR typename sprout::fixed::result_of::erase_n<N, Container>::type
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erase_n(Container const& cont, typename sprout::container_traits<Container>::difference_type pos) {
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return sprout::fixed::detail::erase_n_impl<N, typename sprout::fixed::result_of::erase_n<N, Container>::type>(
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cont,
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sprout::index_range<
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0,
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sprout::container_traits<typename sprout::fixed::result_of::erase_n<N, Container>::type>::static_size
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>::make(),
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sprout::distance(sprout::internal_begin(cont), sprout::next(sprout::begin(cont), pos))
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);
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}
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} // namespace fixed
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namespace result_of {
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using sprout::fixed::result_of::erase_n;
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} // namespace result_of
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using sprout::fixed::erase_n;
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} // namespace sprout
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#endif // #ifndef SPROUT_OPERATION_FIXED_ERASE_N_HPP
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