NAME

std::function::target_type - std::function::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; }
void g(double) {}
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';

// since C++17 deduction guides (CTAD) can avail
std::cout << std::function{g}.target_type().name() << '\n';
}

Possible output: