Programming - C++ Constructors

In C++, the corresponding constructor would be called whenever an object is created. In this post, we deeply dive in the constructors.

Object Arrays

Sometimes, we want to create a static object array. One way to do it is to use object pointers. Are there any other ways to do it? Let’s consider the following simple example.

class Position{
    int x;
    int y;
public:
    Position()
    {
        x = 0;
        y = 0;
    }
    Position(int x_,int y_ = 0)
    {
        x = x_;
        y = y_;
    }
    void PrintXY()
    {
        cout << "x = " << x
             << ", y = " << y << endl;
    }
};

Take the following Position class as an example, you want to create an array of positions whose length is 3. Of course, you can do like that,

Position p1[3];

However, the above method can only work for all positions initializing as 0’s. If we want customized initialization, we could we achieve it. Actually, we can do like the following,

Position p2[3] = { {1,2},3,{0,4} };

By using the above method, you create three position objects, one is initialized as (1,2), one is (3,0), one is (0,4).