mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
synced 2024-12-25 21:35:41 +00:00
69 lines
2.4 KiB
C++
69 lines
2.4 KiB
C++
/*=============================================================================
|
|
Copyright (c) 2011-2014 Bolero MURAKAMI
|
|
https://github.com/bolero-MURAKAMI/Sprout
|
|
|
|
Distributed under the Boost Software License, Version 1.0. (See accompanying
|
|
file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
|
|
=============================================================================*/
|
|
#ifndef SPROUT_NUMERIC_FFT_FIXED_BITREV_TABLE_HPP
|
|
#define SPROUT_NUMERIC_FFT_FIXED_BITREV_TABLE_HPP
|
|
|
|
#include <type_traits>
|
|
#include <sprout/config.hpp>
|
|
#include <sprout/workaround/std/cstddef.hpp>
|
|
#include <sprout/index_tuple/metafunction.hpp>
|
|
#include <sprout/container/traits.hpp>
|
|
#include <sprout/container/functions.hpp>
|
|
#include <sprout/container/indexes.hpp>
|
|
#include <sprout/iterator/operation.hpp>
|
|
#include <sprout/algorithm/fixed/results.hpp>
|
|
#include <sprout/bit/bit_reverse.hpp>
|
|
#include <sprout/bit/bit_length.hpp>
|
|
|
|
namespace sprout {
|
|
namespace fixed {
|
|
namespace detail {
|
|
template<typename Container, sprout::index_t... Indexes>
|
|
inline SPROUT_CONSTEXPR typename sprout::fixed::results::algorithm<Container>::type
|
|
bitrev_table_impl(
|
|
Container const& cont, sprout::index_tuple<Indexes...>,
|
|
std::size_t bit_length,
|
|
typename sprout::container_traits<Container>::difference_type offset,
|
|
typename sprout::container_traits<Container>::size_type size
|
|
)
|
|
{
|
|
return sprout::remake<Container>(
|
|
cont,
|
|
sprout::size(cont),
|
|
(Indexes >= offset && Indexes < offset + size
|
|
? sprout::bit_reverse_in(
|
|
static_cast<typename sprout::container_traits<Container>::value_type>(Indexes - offset),
|
|
bit_length
|
|
)
|
|
: *sprout::next(sprout::internal_begin(cont), Indexes)
|
|
)...
|
|
);
|
|
}
|
|
} // namespace detail
|
|
//
|
|
// bitrev_table
|
|
//
|
|
template<typename Container>
|
|
inline SPROUT_CONSTEXPR typename sprout::fixed::results::algorithm<Container>::type
|
|
bitrev_table(Container const& cont) {
|
|
return sprout::fixed::detail::bitrev_table_impl(
|
|
cont,
|
|
sprout::container_indexes<Container>::make(),
|
|
sprout::empty(cont) ? 0
|
|
: sprout::bit_length(sprout::size(cont) - 1)
|
|
,
|
|
sprout::internal_begin_offset(cont),
|
|
sprout::size(cont)
|
|
);
|
|
}
|
|
} // namespace fixed
|
|
|
|
using sprout::fixed::bitrev_table;
|
|
} // namespace sprout
|
|
|
|
#endif // #ifndef SPROUT_NUMERIC_FFT_FIXED_BITREV_TABLE_HPP
|