What are some advanced constructor techniques in C++?

What are some advanced constructor techniques in C++?

Advanced constructor techniques in C++ include initializer lists, delegating constructors, and default member initializers.

Can you explain initializer lists with an example?

Sure! An initializer list allows you to initialize member variables directly in the constructor's parameter list. For example:

class Point {
public:
    Point(int x, int y) : x_(x), y_(y) {}
private:
    int x_, y_;
};

What are delegating constructors?

Delegating constructors allow one constructor to call another constructor in the same class. This helps reduce code duplication. For example:

class Rectangle {
public:
    Rectangle(int width, int height) : width_(width), height_(height) {}
    Rectangle(int size) : Rectangle(size, size) {}
private:
    int width_, height_;
};

How do default member initializers work?

Default member initializers allow you to provide default values for class members directly in the class definition. For example:

class Circle {
public:
    Circle(double radius = 1.0) : radius_(radius) {}
private:
    double radius_ = 1.0;
};