mirror of
https://github.com/bolero-MURAKAMI/Sprout
synced 2024-11-12 21:09:01 +00:00
64 lines
2 KiB
C++
64 lines
2 KiB
C++
#ifndef SPROUT_FFT_FIXED_BITREV_TABLE_HPP
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#define SPROUT_FFT_FIXED_BITREV_TABLE_HPP
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#include <cstddef>
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#include <type_traits>
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#include <sprout/config.hpp>
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#include <sprout/index_tuple.hpp>
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#include <sprout/fixed_container/traits.hpp>
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#include <sprout/fixed_container/functions.hpp>
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#include <sprout/iterator/operation.hpp>
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#include <sprout/algorithm/fixed/result_of.hpp>
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#include <sprout/integer/bit_reverse.hpp>
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#include <sprout/integer/bit_length.hpp>
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namespace sprout {
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namespace fixed {
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namespace detail {
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template<typename Container, std::ptrdiff_t... Indexes>
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SPROUT_CONSTEXPR inline typename sprout::fixed::result_of::algorithm<Container>::type bitrev_table_impl(
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Container const& cont,
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sprout::index_tuple<Indexes...>,
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std::size_t bit_length,
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typename sprout::fixed_container_traits<Container>::difference_type offset,
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typename sprout::fixed_container_traits<Container>::size_type size
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)
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{
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return sprout::remake_clone<Container>(
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cont,
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sprout::size(cont),
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(Indexes >= offset && Indexes < offset + size
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? sprout::bit_reverse_in(
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static_cast<typename sprout::fixed_container_traits<Container>::value_type>(Indexes - offset),
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bit_length
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)
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: *sprout::next(sprout::fixed_begin(cont), Indexes)
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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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// bitrev_table
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//
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template<typename Container>
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SPROUT_CONSTEXPR inline typename sprout::fixed::result_of::algorithm<Container>::type bitrev_table(
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Container const& cont
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)
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{
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return sprout::fixed::detail::bitrev_table_impl(
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cont,
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typename sprout::index_range<0, sprout::fixed_container_traits<Container>::fixed_size>::type(),
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sprout::empty(cont)
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? 0
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: sprout::bit_length(sprout::size(cont) - 1)
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,
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sprout::fixed_begin_offset(cont),
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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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using sprout::fixed::bitrev_table;
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} // namespace sprout
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#endif // #ifndef SPROUT_FFT_FIXED_BITREV_TABLE_HPP
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