Can't create multiple objects in class

Question

When I try to create more than one object, I get an error saying no matching function for call. I don't understand, usually I can create as many objects as I want without a hitch but the moment I add a parameterized constructor in the equation, suddenly I'm not allowed to create more than one object. Why is it so?

Here's the code:

#include <iostream>

using namespace std;

class Point
{
private:
    int x, y;
public:
    Point(int x1, int y1)
    {
        x = x1;
        y = y1;
    }
    int getx()
    {
        return x;
    }

    int gety()
    {
        return y;
    }
};

int main()
{
    Point c2, c3;
    Point c = Point(10, 20);
    cout << c.getx() << " " << c2.gety() << " " << c3.getx() << endl;
    return 0;
}

Remy Lebeau · Accepted Answer · 2021-06-26 22:00:27Z

7

You explicitly declared a constructor Point(int x1, int y1), so the compiler-generated default constructor is disabled.

You can add one to the class declaration like this:

Point() : x(0), y(0) {}

Or, in C++11 or later, you can add a default constructor like this (be careful, the int members won't be initialized by this):

Point() = default;

edited Jun 26, 2021 at 22:00

Remy Lebeau

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answered Jun 26, 2021 at 20:01

MikeCAT

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1 Comment

Remy Lebeau Over a year ago

"be careful, the int members won't be initialized by this" - they will be if you declare them with default values, eg: private: int x = 0; int y = 0; That is another feature added in C++11 to compliment the = default feature. An alternative would be to simply merge the 2 constructors together: Point(int x1 = 0, int y1 = 0) : x(x1), y(y1) { } That will allow a single constructor to act as both a converting constructor and a default constructor.

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