Named constructor

最新推荐文章于 2025-02-02 17:02:37 发布

原创最新推荐文章于 2025-02-02 17:02:37 发布 · 469 阅读

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#constructor #float #access #class

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本文介绍了一种使用命名构造函数实现点类构造的C++编程技巧。通过静态成员函数提供两种构造方式：直角坐标和极坐标。这种方式不仅保持了代码的简洁性和可读性，而且在性能上与直接调用构造函数相当。

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//This is called : Named Constructor Idiom.
//Note that this way, at least as implemented below, is Just as fast as directly
//call a constructor.
class Point {
public:
	static Point _Rectanglular(float x, float y);	//recrangular coord's.
	static Point _Polar(float radius, float andgle);
//If you wanna derived class access this constructor, set //'protected'.
private:
	Point(float x, float y);
	float m_x, m_y;
};

inline Point::Point(float x, float y)
	:m_x(x), m_y(y){ }
//Just rename the constructor.
//Returns a temp object.
inline Point Point::_Rectanglular(float x, float y)
{
	return Point(x, y);
}

inline Point Point::_Polar(float radius, float angle)
{
	return Point(radius * std::cos(angle), radius * std::sin(angle));
}