apply.hpp

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#ifndef LIBFILEZILLA_APPLY_HEADER
#define LIBFILEZILLA_APPLY_HEADER
 
#include <cstddef>
#include <utility>
#include <tuple>
#include <type_traits>

 
namespace fz {

template<typename Obj, typename F, typename Tuple, size_t... I>
auto apply_(Obj&& obj, F&& f, Tuple&& t, std::index_sequence<I...> const&) -> decltype((std::forward<Obj>(obj)->*std::forward<F>(f))(std::get<I>(std::forward<Tuple>(t))...))
{
    return (std::forward<Obj>(obj)->*std::forward<F>(f))(std::get<I>(std::forward<Tuple>(t))...);
}

template<typename Obj, typename F, typename Tuple, typename Seq = typename std::make_index_sequence<std::tuple_size_v<typename std::remove_reference_t<Tuple>>>>
auto apply(Obj&& obj, F && f, Tuple&& args) -> decltype(apply_(std::forward<Obj>(obj), std::forward<F>(f), std::forward<Tuple>(args), Seq()))
{
    return apply_(std::forward<Obj>(obj), std::forward<F>(f), std::forward<Tuple>(args), Seq());
}
 
}
 
#endif