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#ifndef PYTHONIC_INCLUDE_FUNCTOOLS_PARTIAL_HPP
#define PYTHONIC_INCLUDE_FUNCTOOLS_PARTIAL_HPP
#include "pythonic/include/utils/functor.hpp"
#include "pythonic/include/utils/seq.hpp"
#include <utility>
#include <tuple>
PYTHONIC_NS_BEGIN
namespace functools
{
namespace details
{
/* a task that captures its environment for later call */
template <typename... ClosureTypes>
struct task {
using callable = void;
friend std::ostream &operator<<(std::ostream &os, task)
{
return os << "partial_function_wrapper";
}
mutable std::tuple<ClosureTypes...> closure; // closure associated to
// the task, mutable
// because pythran assumes
// all function calls are
// const
task();
task(task const &) = default;
task(ClosureTypes const &... types);
template <std::size_t... S, typename... Types>
auto call(utils::index_sequence<S...>, Types &&... types) const
-> decltype(std::get<0>(closure)(std::get<S + 1>(closure)...,
std::forward<Types>(types)...))
{
return std::get<0>(closure)(std::get<S + 1>(closure)...,
std::forward<Types>(types)...);
}
template <typename... Types>
auto operator()(Types &&... types) const -> decltype(
this->call(utils::make_index_sequence<sizeof...(ClosureTypes)-1>(),
std::forward<Types>(types)...));
};
}
template <typename... Types>
// remove references as closure capture the env by copy
details::task<typename std::remove_cv<
typename std::remove_reference<Types>::type>::type...>
partial(Types &&... types);
DEFINE_FUNCTOR(pythonic::functools, partial);
}
PYTHONIC_NS_END
#endif
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