function::operator()
Calls a callable object.
result_type operator()(T1 t1, T2 t2, ..., TN tN);
Parameters
TN
The type of the Nth call argument.tN
The Nth call argument.
Remarks
The member function returns INVOKE(fn, t1, t2, ..., tN, Ret), where fn is the target object stored in *this. You use it to call the wrapped callable object.
Example
// std_tr1__functional__function_operator_call.cpp
// compile with: /EHsc
#include <functional>
#include <iostream>
int neg(int val)
{
return (-val);
}
int main()
{
std::function<int (int)> fn1(neg);
std::cout << std::boolalpha << "empty == " << !fn1 << std::endl;
std::cout << "val == " << fn1(3) << std::endl;
return (0);
}
empty == false val == -3
Requirements
Header: <functional>
Namespace: std