apply.hpp

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#ifndef ESTD_APPLY_HPP_
#define ESTD_APPLY_HPP_

#include "estd/IntegerSequence.hpp"
#include "estd/invoke.hpp"

#include <tuple>

namespace estd
{

namespace internal
{

template<typename Function, typename Tuple, std::size_t... Indexes>
constexpr auto apply(Function&& function, Tuple&& tuple, estd::IndexSequence<Indexes...>) ->
        decltype(estd::invoke(std::forward<Function>(function), std::get<Indexes>(std::forward<Tuple>(tuple))...))
{
    return estd::invoke(std::forward<Function>(function), std::get<Indexes>(std::forward<Tuple>(tuple))...);
}

} // namespace internal

template <typename Function, typename Tuple>
constexpr auto apply(Function&& function, Tuple&& tuple) ->
        decltype(internal::apply(std::forward<Function>(function), std::forward<Tuple>(tuple),
                estd::MakeIndexSequence<std::tuple_size<typename std::decay<Tuple>::type>{}>{}))
{
    return internal::apply(std::forward<Function>(function), std::forward<Tuple>(tuple),
            estd::MakeIndexSequence<std::tuple_size<typename std::decay<Tuple>::type>{}>{});
}

}   // namespace estd

#endif  // ESTD_APPLY_HPP_