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add C++11constexpr fft

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Stockham DIT fft algorithm written in C++11constexpr
This commit is contained in:
lpha-z 2016-09-12 18:13:01 +09:00
parent f08464943f
commit e6af368c77
9 changed files with 575 additions and 169 deletions
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55
sprout/numeric/fft/fit/ifft.hpp Normal file
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/*=============================================================================
Copyright (c) 2011-2016 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_FIT_IFFT_HPP
#define SPROUT_NUMERIC_FFT_FIT_IFFT_HPP
#include <sprout/config.hpp>
#include <sprout/iterator/distance.hpp>
#include <sprout/container/traits.hpp>
#include <sprout/container/functions.hpp>
#include <sprout/numeric/fft/fixed/ifft.hpp>
#include <sprout/algorithm/fit/results.hpp>
#include <sprout/sub_array/sub_array.hpp>
#include <sprout/sub_array/sub.hpp>
#include <sprout/pit/pit.hpp>
namespace sprout {
namespace fit {
namespace detail {
template<typename ForwardIterator, typename Result>
inline SPROUT_CONSTEXPR typename sprout::fit::results::algorithm<Result>::type
ifft_impl(
ForwardIterator const& first, ForwardIterator const& last, Result const& result,
typename sprout::container_traits<Result>::difference_type offset
)
{
return sprout::sub_copy(
sprout::get_internal(sprout::fixed::ifft(first, last, result)),
offset,
offset + sprout::fit_size(result, sprout::distance(first, last))
);
}
} // namespace detail
//
// ifft
//
template<typename ForwardIterator, typename Result>
inline SPROUT_CONSTEXPR typename sprout::fit::results::algorithm<Result>::type
ifft(ForwardIterator first, ForwardIterator last, Result const& result) {
return sprout::fit::detail::ifft_impl(first, last, result, sprout::internal_begin_offset(result));
}
template<typename Result, typename ForwardIterator>
inline SPROUT_CONSTEXPR typename sprout::fixed::results::algorithm<Result>::type
ifft(ForwardIterator first, ForwardIterator last) {
return sprout::fit::ifft(first, last, sprout::pit<Result>());
}
} // namespace fit
} // namespace sprout
#endif // #ifndef SPROUT_NUMERIC_FFT_FIT_IFFT_HPP