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#ifndef PYTHONIC_BUILTIN_REDUCE_HPP
#define PYTHONIC_BUILTIN_REDUCE_HPP
#include "pythonic/include/builtins/reduce.hpp"
#include "pythonic/utils/functor.hpp"
#include <algorithm>
#include <numeric>
#include <utility>
PYTHONIC_NS_BEGIN
namespace builtins
{
template <class Iterable, class Operator>
auto reduce(Operator op, Iterable s)
-> decltype(op(std::declval<typename std::iterator_traits<
typename Iterable::iterator>::value_type>(),
std::declval<typename std::iterator_traits<
typename Iterable::iterator>::value_type>()))
{
auto iter = s.begin();
auto r = *iter;
++iter;
if (iter != s.end())
return std::accumulate(iter, s.end(), r, op);
else
return r;
}
template <class Iterable, class Operator, class T>
auto reduce(Operator op, Iterable s, T const &init)
-> decltype(std::accumulate(
s.begin(), s.end(),
static_cast<reduce_helper_t<Iterable, Operator, T>>(init), op))
{
return std::accumulate(
s.begin(), s.end(),
static_cast<reduce_helper_t<Iterable, Operator, T>>(init), op);
}
}
PYTHONIC_NS_END
#endif
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