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48 lines
1.4 KiB
C++
48 lines
1.4 KiB
C++
#ifndef SPROUT_FUNCTIONAL_DFT_FIXED_DFT_ELEMENT_HPP
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#define SPROUT_FUNCTIONAL_DFT_FIXED_DFT_ELEMENT_HPP
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#include <iterator>
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#include <sprout/config.hpp>
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#include <sprout/functional/dft/detail/dft_element_gen.hpp>
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#include <sprout/math/constants.hpp>
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#include HDR_ITERATOR_SSCRISK_CEL_OR_SPROUT_DETAIL
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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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SPROUT_CONSTEXPR inline typename std::iterator_traits<InputIterator>::value_type dft_element_impl(
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InputIterator first,
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InputIterator last,
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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,
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last,
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-(2 * sprout::math::pi<elem_type>() * i / size)
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);
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}
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} // namespace detail
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//
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// dft_element
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//
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template<typename InputIterator>
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SPROUT_CONSTEXPR inline typename std::iterator_traits<InputIterator>::value_type dft_element(
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InputIterator first,
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InputIterator last,
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typename std::iterator_traits<InputIterator>::difference_type i
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)
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{
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return sprout::detail::dft_element_impl(
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first,
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last,
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i,
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NS_SSCRISK_CEL_OR_SPROUT_DETAIL::distance(first, last)
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);
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}
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} // namespace sprout
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#endif // #ifndef SPROUT_FUNCTIONAL_DFT_FIXED_DFT_ELEMENT_HPP
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