< cpp‎ | utility‎ | functional‎ | function
Function objects
Function wrappers
Reference wrappers
Operator wrappers
Deprecated binders and adaptors
template< class T >
T* target();
(1) (since C++11)
template< class T >
const T* target() const;
(2) (since C++11)

Returns a pointer to the stored callable function target.


[edit] Parameters


[edit] Return value

A pointer to the stored function if target_type() == typeid(T), otherwise a null pointer.

[edit] Exceptions

noexcept specification:  

[edit] Example

#include <functional>
#include <iostream>
int f(int, int) { return 1; }
int g(int, int) { return 2; }
void test(std::function<int(int, int)> const& arg)
    std::cout << "test function: ";
    if (<std::plus<int>>())
        std::cout << "it is plus\n";
    if (<std::minus<int>>())
        std::cout << "it is minus\n";
    int (*const* ptr)(int, int) =<int(*)(int, int)>();
    if (ptr && *ptr == f)
        std::cout << "it is the function f\n";
    if (ptr && *ptr == g)
        std::cout << "it is the function g\n";
int main()
    test(std::function<int(int, int)>(std::plus<int>()));
    test(std::function<int(int, int)>(std::minus<int>()));
    test(std::function<int(int, int)>(f));
    test(std::function<int(int, int)>(g));


test function: it is plus
test function: it is minus
test function: it is the function f
test function: it is the function g

[edit] See also

obtains the typeid of the stored target of a std::function
(public member function)