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https://github.com/bolero-MURAKAMI/Sprout.git
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49 lines
1.8 KiB
C++
49 lines
1.8 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2018 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_NUMERIC_DFT_IDFT_ELEMENT_HPP
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#define SPROUT_NUMERIC_DFT_IDFT_ELEMENT_HPP
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#include <iterator>
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#include <sprout/config.hpp>
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#include <sprout/math/constants.hpp>
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#include <sprout/iterator/operation.hpp>
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#include <sprout/numeric/dft/detail/dft_element_gen.hpp>
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namespace sprout {
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namespace detail {
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template<typename InputIterator, typename Size>
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inline SPROUT_CONSTEXPR typename std::iterator_traits<InputIterator>::value_type
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idft_element_impl(
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InputIterator const& first, InputIterator const& last, typename std::iterator_traits<InputIterator>::difference_type i,
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Size size
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)
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{
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typedef typename std::iterator_traits<InputIterator>::value_type value_type;
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typedef typename value_type::value_type elem_type;
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return sprout::detail::dft_element_gen(
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first, last,
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sprout::math::two_pi<elem_type>() * i / size
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)
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/ static_cast<elem_type>(size)
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;
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}
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} // namespace detail
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//
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// idft_element
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//
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template<typename InputIterator>
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inline SPROUT_CONSTEXPR typename std::iterator_traits<InputIterator>::value_type
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idft_element( InputIterator first, InputIterator last, typename std::iterator_traits<InputIterator>::difference_type i) {
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return sprout::detail::idft_element_impl(
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first, last, i,
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sprout::distance(first, last)
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);
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}
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} // namespace sprout
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#endif // #ifndef SPROUT_NUMERIC_DFT_IDFT_ELEMENT_HPP
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