Parameterized Constructor Object creation using name

Question

class Point
{
private:
int x, y;
public:
Point()
{
}
// Parameterized Constructor
Point(int x1)
{
 x=x1;
}
Point(int x1, int y1)
{
    x = x1;
    y = y1;
}
int getX()
{
    return x;
}
int getY()
{
    return y;
}
};
int main()
{
   Point p(10);
   p = Point(50,100);
}

does Point(50,100) returns an object??Can Anyone explain the details about the execution in main function. for assigning p with Point(50,100) it should give an object.

It does returns an instance of Point, which in turn is assigned to the p using implicitly-defined copy-assignment operator (memberwise copies all the data members, x and y in this case). — rawrex
– rawrex, Commented Jul 9, 2021 at 11:06
Why do you call it "parameterized constructor"? It is a regular constructor. — Igor R.
– Igor R., Commented Jul 9, 2021 at 11:08
@IgorR i suspect some tutorial, for example this is a particularly poor one that uses the term and spreads more misinformation geeksforgeeks.org/constructors-c — 463035818_is_not_an_ai
– 463035818_is_not_an_ai, Commented Jul 9, 2021 at 11:13
fwiw, the distinction between a default constructor and a "parametrized constructor" as it is made eg in the link above is wrong and misleading. Default constructors can take parameters too, what distinguishes them is that they can be called without parameters. "parametrized constructor" is not a common term and neither is it very useful — 463035818_is_not_an_ai
– 463035818_is_not_an_ai, Commented Jul 9, 2021 at 11:14

Adrian Mole · Accepted Answer · 2021-07-09 11:58:48Z

1

Here Point(50,100) creates an object then calls the assignment operator of the class Point which is generated as default by the compiler and basically copies memory of righthand operand into left hand operand. After copying, it also calls the destructor for the Point(50,100).

You can check this by adding a destructor to your function.

~Point()
{
    std::cout<<"destructor"<<x<<std::endl;
}

edited Jul 9, 2021 at 11:58

Adrian Mole

52.1k193 gold badges61 silver badges101 bronze badges

answered Jul 9, 2021 at 11:15

hakob kirakosyan

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