mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
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107 lines
3.7 KiB
C++
107 lines
3.7 KiB
C++
#ifndef SPROUT_OPERATION_FIXED_RESIZE_BACKWARD_HPP
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#define SPROUT_OPERATION_FIXED_RESIZE_BACKWARD_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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#include <sprout/operation/fixed/resize.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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// resize_backward
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//
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template<std::size_t N, typename Container>
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struct resize_backward
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: public sprout::fixed::result_of::resize<N, Container>
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{};
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} // namespace result_of
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namespace detail {
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template<typename Result, typename Container, typename T, sprout::index_t... Indexes>
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inline SPROUT_CONSTEXPR Result resize_backward_impl(
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Container const& cont,
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sprout::index_tuple<Indexes...>,
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typename sprout::container_traits<Result>::difference_type size,
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typename sprout::container_traits<Result>::difference_type offset,
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T const& v
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)
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{
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return sprout::make<Result>(
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(Indexes >= offset && Indexes < offset + size
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? *sprout::next(sprout::begin(cont), Indexes - offset)
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: v
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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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// resize_backward
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//
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template<std::size_t N, typename Container, typename T>
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inline SPROUT_CONSTEXPR typename sprout::fixed::result_of::resize_backward<N, Container>::type resize_backward(
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Container const& cont,
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T const& v
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)
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{
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return sprout::fixed::detail::resize_backward_impl<typename sprout::fixed::result_of::resize_backward<N, Container>::type>(
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cont,
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typename sprout::index_range<0, sprout::container_traits<typename sprout::fixed::result_of::resize_backward<N, Container>::type>::static_size>::type(),
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sprout::size(cont),
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static_cast<typename sprout::container_traits<Container>::difference_type>(
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sprout::container_traits<typename sprout::fixed::result_of::resize_backward<N, Container>::type>::static_size
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)
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- sprout::size(cont),
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v
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);
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}
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namespace detail {
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template<typename Result, typename Container, sprout::index_t... Indexes>
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inline SPROUT_CONSTEXPR Result resize_backward_impl(
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Container const& cont,
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sprout::index_tuple<Indexes...>,
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typename sprout::container_traits<Result>::difference_type size,
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typename sprout::container_traits<Result>::difference_type offset
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)
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{
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return sprout::make<Result>(
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(Indexes >= offset && Indexes < offset + size
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? *sprout::next(sprout::begin(cont), Indexes - offset)
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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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// resize_backward
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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::resize_backward<N, Container>::type resize_backward(
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Container const& cont
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)
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{
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return sprout::fixed::detail::resize_backward_impl<typename sprout::fixed::result_of::resize_backward<N, Container>::type>(
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cont,
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typename sprout::index_range<0, sprout::container_traits<typename sprout::fixed::result_of::resize_backward<N, Container>::type>::static_size>::type(),
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sprout::size(cont),
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static_cast<typename sprout::container_traits<Container>::difference_type>(
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sprout::container_traits<typename sprout::fixed::result_of::resize_backward<N, Container>::type>::static_size
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)
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- sprout::size(cont)
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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::resize_backward;
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} // namespace result_of
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using sprout::fixed::resize_backward;
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} // namespace sprout
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#endif // #ifndef SPROUT_OPERATION_FIXED_RESIZE_BACKWARD_HPP
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