What is the method of calling object's constructor in a function?

Answer 1

A constructor is not a function (it has no return value, not even void). As such you cannot call a constructor as you would a function. Constructors are always invoked automatically whenever an object of the class is instantiated.

For example:

struct S {

// ...class has implicit default constructor

};

static S s1; // instantiate an object of type S in static memory

void f () { S s2; // instantiate an object of type S on the call stack

} // s2 falls from scope here

void g() {

S* p = new S; // instantiate an object of type S on the heap

// ...

delete p; // release the object pointed to by p

} // p falls from scope here

int main() {

f(); // call function f

g(); // call function g

} // s1 falls from scope here