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https://github.com/bolero-MURAKAMI/Sprout.git
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110 lines
4 KiB
C++
110 lines
4 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2019 Bolero MURAKAMI
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https://github.com/bolero-MURAKAMI/Sprout
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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=============================================================================*/
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#ifndef SPROUT_OPERATION_FIXED_RESIZE_BACKWARD_HPP
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#define SPROUT_OPERATION_FIXED_RESIZE_BACKWARD_HPP
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#include <sprout/config.hpp>
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#include <sprout/workaround/std/cstddef.hpp>
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#include <sprout/index_tuple/metafunction.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/container/indexes.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 results {
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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::results::resize<N, Container>
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{};
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} // namespace results
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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
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resize_backward_impl(
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Container const& cont, 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::results::resize_backward<N, Container>::type
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resize_backward(Container const& cont, T const& v) {
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return sprout::fixed::detail::resize_backward_impl<typename sprout::fixed::results::resize_backward<N, Container>::type>(
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cont,
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sprout::container_indexes<typename sprout::fixed::results::resize_backward<N, Container>::type>::make(),
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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::results::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
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resize_backward_impl(
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Container const& cont, 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::results::resize_backward<N, Container>::type
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resize_backward(Container const& cont) {
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return sprout::fixed::detail::resize_backward_impl<typename sprout::fixed::results::resize_backward<N, Container>::type>(
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cont,
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sprout::container_indexes<typename sprout::fixed::results::resize_backward<N, Container>::type>::make(),
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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::results::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 results {
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using sprout::fixed::results::resize_backward;
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} // namespace results
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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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