std::function<R(Args...)>::target_type
From cppreference.com
< cpp | utility | functional | function
const std::type_info& target_type() const noexcept; |
(since C++11) | |
Returns the type of the stored function.
Contents |
[edit] Parameters
(none)
[edit] Return value
typeid(T) if the stored function has type T
, otherwise typeid(void)
[edit] 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:
PFiiE Z4mainEUliE_ PFvdE
[edit] See also
obtains a pointer to the stored target (public member function) | |
contains some type’s information, the class returned by the typeid operator (class) | |
typeid | queries information of a type, returning a std::type_info object representing the type(operator) |