std::function<R(Args...)>::target_type - cppreference.com
From cppreference.com
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(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
#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:
See also
| obtains a pointer to the stored target (public member function) [edit] | |
| contains some type’s information, the class returned by the typeid operator (class) [edit] | |
| typeid | queries information of a type, returning a std::type_info object representing the type(operator) |