C++ this in constructor? [duplicate]

This question already has answers here: 开发者_运维问答 Closed 11 years ago.

Possible Duplicate:

c++ call constructor from constructor

How to do "self" (this) assignments in c++?

Java:

 public Point(Point p) {
        this(p.x, p.y);
    }

How would do this in C++?

Would it be similar only this->(constructor of point that takes x, constructor of point that takes y);?

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In C++0x, you can use delegating constructors:

Point(const Point &p) : Point(p.x, p.y) { }

Note that no compiler has full support for C++0x yet; this particular feature is not yet implemented in G++.

In older versions of C++, you have to delegate to a private construction function:

private:
    void init(int x, int y) { ... }
public:
    Point(const Point &p) { init(p.x, p.y); }
    Point(int x, int y)   { init(x, y); }

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If I understand what you mean by this Java code (a constructor that relies on another constructor of the same class to do the job):

public Point(Point p) {
    this(p.x, p.y);
}

this is how I would express the same in C++:

class Point {

    Point(const Point& p)
       : Point(p.x, p.y) 
    {
        ...
    }
};

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If you call another constructor of the same class it will create a new object.

If you want to do this, you should put the constructor logic in an init method and call it from all constructors.