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std::experimental::apply(3) C++ Standard Libary std::experimental::apply(3) NAME std::experimental::apply - std::experimental::apply Synopsis Defined in header <experimental/tuple> template <class F, class Tuple> (library funda- mentals TS) constexpr decltype(auto) apply(F&& f, Tuple&& t); Invoke the Callable object f with a tuple of arguments. Parameters f - Callable object to be invoked t - tuple whose elements to be used as arguments to f Return value What returned by f. Possible implementation namespace detail { template <class F, class Tuple, std::size_t... I> constexpr decltype(auto) apply_impl( F&& f, Tuple&& t, std::in- dex_sequence<I...> ) { return std::invoke(std::forward<F>(f), std::get<I>(std::for- ward<Tuple>(t))...); // Note: std::invoke is a C++17 feature } } // namespace detail template <class F, class Tuple> constexpr decltype(auto) apply(F&& f, Tuple&& t) { return detail::apply_impl(std::forward<F>(f), std::forward<Tu- ple>(t), std::make_index_sequence<std::tuple_size_v<std::decay_t<Tu- ple>>>{}); } Example // Run this code #include <iostream> #include <tuple> template<typename... Ts> void print_tuple (const std::tuple<Ts...> &tuple) { std::apply ([] (const auto &... elem) { ((std::cout << elem << '\n'), ...); }, tuple); } int main() { const std::tuple<int, char> t = std::make_tuple(5, 'a'); print_tuple(t); } Output: 5 a See also make_tuple creates a tuple object of the type defined by the argument types (C++11) (function template) forward_as_tuple creates a tuple of forwarding references (C++11) (function template) http://cppreference.com 2022.07.31 std::experimental::apply(3)
NAME | Synopsis | Parameters | Return value | Possible implementation | Example | Output: | See also
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