Function Call Operator: ()
A postfix-expression followed by the function-call operator, ( ), specifies a function call.
postfix-expression ( [argument-expression-list ] )
Remarks
The arguments to the function-call operator are zero or more expressions separated by commas — the actual arguments to the function.
The postfix-expression must evaluate to a function address (for example, a function identifier or the value of a function pointer), and argument-expression-list is a list of expressions (separated by commas) whose values (the arguments) are passed to the function. The argument-expression-list argument can be empty.
The postfix-expression must be of one of these types:
Function returning type T. An example declaration is
T func( int i )Pointer to a function returning type T. An example declaration is
T (*func)( int i )Reference to a function returning type T. An example declaration is
T (&func)(int i)Pointer-to-member function dereference returning type T. Example function calls are
(pObject->*pmf)(); (Object.*pmf)();
Example
The following example calls the standard library function strcat_s with two arguments:
// expre_Function_Call_Operator.cpp
// compile with: /EHsc
#include <iostream>
#include <string>
// STL name space
using namespace std;
int main()
{
enum
{
sizeOfBuffer = 20
};
char s1[ sizeOfBuffer ] = "Welcome to ";
char s2[ ] = "C++";
strcat_s( s1, sizeOfBuffer, s2 );
cout << s1 << endl;
}
Welcome to C++