< cpp‎ | utility
Utilities library
General utilities
Relational operators (deprecated in C++20)
Integer comparison functions
Swap and type operations

Common vocabulary types

Elementary string conversions

Defined in header <tuple>
template <class F, class Tuple>
constexpr decltype(auto) apply(F&& f, Tuple&& t);
(since C++17)

Invoke the Callable object f with a tuple of arguments.


[edit] Parameters

f - Callable object to be invoked
t - tuple whose elements to be used as arguments to f

[edit] Return value

The value returned by f.

[edit] Notes

The tuple need not be std::tuple, and instead may be anything that supports std::get and std::tuple_size; in particular, std::array and std::pair may be used.

[edit] Possible implementation

namespace detail {
template <class F, class Tuple, std::size_t... I>
constexpr decltype(auto) apply_impl(F&& f, Tuple&& t, std::index_sequence<I...>)
    // This implementation is valid since C++20 (via P1065R2)
    // In C++17, a constexpr counterpart of std::invoke is actually needed here
    return std::invoke(std::forward<F>(f), std::get<I>(std::forward<Tuple>(t))...);
}  // 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<Tuple>(t),

[edit] Example

#include <iostream>
#include <tuple>
#include <utility>
int add(int first, int second) { return first + second; }
template<typename T>
T add_generic(T first, T second) { return first + second; }
auto add_lambda = [](auto first, auto second) { return first + second; };
template<typename... Ts>
std::ostream& operator<<(std::ostream& os, std::tuple<Ts...> const& theTuple)
        [&os](Ts const&... tupleArgs)
            os << '[';
            std::size_t n{0};
            ((os << tupleArgs << (++n != sizeof...(Ts) ? ", " : "")), ...);
            os << ']';
        }, theTuple
    return os;
int main()
    // OK
    std::cout << std::apply(add, std::pair(1, 2)) << '\n';
    // Error: can't deduce the function type
    // std::cout << std::apply(add_generic, std::make_pair(2.0f, 3.0f)) << '\n'; 
    // OK
    std::cout << std::apply(add_lambda, std::pair(2.0f, 3.0f)) << '\n'; 
    // advanced example
    std::tuple myTuple(25, "Hello", 9.31f, 'c');
    std::cout << myTuple << '\n';


[25, Hello, 9.31, c]

[edit] See also

creates a tuple object of the type defined by the argument types
(function template) [edit]
creates a tuple of forwarding references
(function template) [edit]
Construct an object with a tuple of arguments
(function template) [edit]
invokes any Callable object with given arguments and possibility to specify return type (since C++23)
(function template) [edit]