std::function::target_type (3) Linux Manual Page

std::function<R(Args…)>::target_type – std::function<R(Args…)>::target_type

Synopsis

const std::type_info &target_type() const noexcept;
(since C++ 11)

Returns the type of the stored function.

Parameters

(none)

Return value

typeid(T) if the stored function has type T, otherwise typeid(void)

Example

// Run this code

#include <functional>

#include <iostream>
int f(int a)
{
    return -a;
}

int main()

{
    // fn1 and fn2 have the same type, but their targets do not
    std::function<int(int)> fn1(f),
        fn2([](int a) { return -a; });
    std::cout << fn1.target_type().name() << '\n'
              << fn2.target_type().name() << '\n';
}

Possible output:

  int (*)(int)
  main::$_0

See also

       obtains a pointer to the stored target
target (public member function)