mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
synced 2024-11-16 10:49:05 +00:00
40 lines
1.4 KiB
C++
40 lines
1.4 KiB
C++
#ifndef SPROUT_FUNCTIONAL_DFT_DETAIL_DFT_ELEMENT_GEN_HPP
|
|
#define SPROUT_FUNCTIONAL_DFT_DETAIL_DFT_ELEMENT_GEN_HPP
|
|
|
|
#include <cmath>
|
|
#include <iterator>
|
|
#include <type_traits>
|
|
#include <sprout/config.hpp>
|
|
#include <sprout/iterator/operation.hpp>
|
|
|
|
namespace sprout {
|
|
namespace detail {
|
|
template<typename InputIterator>
|
|
SPROUT_CONSTEXPR inline typename std::iterator_traits<InputIterator>::value_type dft_element_gen(
|
|
InputIterator first,
|
|
InputIterator last,
|
|
typename std::iterator_traits<InputIterator>::value_type::value_type arg,
|
|
typename std::iterator_traits<InputIterator>::difference_type k = 0,
|
|
typename std::iterator_traits<InputIterator>::value_type value = typename std::iterator_traits<InputIterator>::value_type(),
|
|
typename std::iterator_traits<InputIterator>::value_type::value_type theta = typename std::iterator_traits<InputIterator>::value_type::value_type()
|
|
)
|
|
{
|
|
typedef typename std::iterator_traits<InputIterator>::value_type value_type;
|
|
using std::cos;
|
|
using std::sin;
|
|
return first != last
|
|
? value + sprout::detail::dft_element_gen(
|
|
sprout::next(first),
|
|
last,
|
|
arg,
|
|
k + 1,
|
|
*first * value_type(cos(theta), sin(theta)),
|
|
arg * (k + 1)
|
|
)
|
|
: value
|
|
;
|
|
}
|
|
} // namespace detail
|
|
} // namespace sprout
|
|
|
|
#endif // #ifndef SPROUT_FUNCTIONAL_DFT_DETAIL_DFT_ELEMENT_GEN_HPP
|