C++对象模型深度剖析:构造、封装与高效编程

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《深入C++对象模型》(Inside the C++ Object Model)是一本深度剖析C++面向对象编程内部机制的专业书籍。它主要关注支持C++中面向对象编程的核心元素,包括构造函数的语义、临时对象的生成、封装、继承以及虚函数和虚继承。这本书对于提升程序员对C++底层实现的理解至关重要,帮助读者编写出更高效且信心满满的代码。 作者挑战了关于C++过度复杂和性能开销的普遍误解,揭示了其中隐藏的成本与权衡。书中详述了各种实现模型的历史发展,解释它们为何如此设计,并分析了这些模型对程序设计的语义影响,以及它们如何塑造实际的编程实践。 该书的亮点在于: 1. 深入探究C++对象模型中蕴含的面向对象编程行为,通过实际案例展示其在编程中的隐性作用。 2. 清晰地讲解了面向对象特性的基本实现,以及这些特性背后可能带来的性能折衷。读者可以在这里学习如何在功能和效率之间找到平衡。 3. 从性能优化的角度审视程序的转变过程,帮助开发者识别潜在的性能瓶颈,并提供改进策略。 4. 阐述了不同实现策略之间的选择和影响,以及未来可能的发展趋势,使读者能够预见并应对技术的演变。 《深入C++对象模型》不仅是一本技术指南,还是一本启发思考的工具书,它鼓励读者在理解和掌握C++核心原理的同时,也培养批判性思维,以便在实际项目中做出明智的设计决策。无论是初学者还是经验丰富的开发人员,这本书都提供了深入了解C++对象模型,提高编程技能和效率的宝贵资源。

帮我写出以下java代码:Add a class Bubble that extends Shape. The Bubble class has an instance variable called radius of type double that represents the radius of the bubble. The constructor of the Bubble class takes an x and a y as arguments, which represent the position of the new bubble. The radius of a new bubble is always 10 and never changes after that. The isVisible method indicates whether the bubble is currently visible inside a window of width w and height h (position (0, 0) is in the upper-left corner of the window). The bubble is considered visible if at least one pixel of the bubble is visible. Therefore a bubble might be visible even when its center is outside the window, as long as the edge of the bubble is still visible inside the window. The code of the isVisible method is a little bit complex, mostly because of the case where the center of the circle is just outside one of the corners of the window. So here is the code of the isVisible method, which you can directly copy-paste into your assignment: // Find the point (wx, wy) inside the window which is closest to the // center (x, y) of the circle. In other words, find the wx in the // interval [0, w - 1] which is closest to x, and find the wy in the // interval [0, h - 1] which is closest to y. // If the distance between (wx, wy) and (x, y) is less than the radius // of the circle (using Pythagoras's theorem) then at least part of // the circle is visible in the window. // Note: if the center of the circle is inside the window, then (wx, wy) // is the same as (x, y), and the distance is 0. public boolean isVisible(int w, int h) { double x = getX(); double y = getY(); double wx = (x < 0 ? 0 : (x > w - 1 ? w - 1 : x)); double wy = (y < 0 ? 0 : (y > h - 1 ? h - 1 : y)); double dx = wx - x; double dy = wy - y; return dx * dx + dy * dy <= radius * radius; } The isIn method indicates whether the point at coordinates (x, y) (which are the arguments of the method) is currently inside the bubble or not. The edge of the bubble counts as being inside of the bubble. HINT: use Pythagoras's theorem to compute the distance from the center of the bubble to the point (x, y). The draw method uses the graphics object g to draw the bubble. HINT: remember that the color of the graphics object g is changed in the draw method of the superclass of Bubble. Also add a testBubble method to test all your methods (including inherited methods, but excluding the isVisible method, which I provide, and excluding the draw method since it requires as argument a graphics object g that you

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