Chapter 8 Classes and Objects

主要是一些名词Q^Q

1.头文件：It is common to place struct type declarations with TypeNames in a (.h) header file and # include that file.

不要在头文件用using，这样的话可能导致某些cpp文件里有冲突。

2.Aggregate（聚合）struct Operations

3.Visibility Modifiers（可见修饰）分为public和private（还有protected等等）

区别：public features can be seen and manipulated (操 纵)by anybody --they are the external (interface or service) view. private features can be manipulated only within a class. They are the internal (implementation) view.

4.built-in（内置）operations：

member selection using dot ( . ) operator ,  assignment to another class variable using ( = ),  pass to a function as argument (by value or by reference),  returnas value of a function

其他操作可以被定义为类的成员函数。

5.Encapsulation（封装）防止类变成公交车TwT

6.separate files Generally Used forclassType（多文件）

.h：定义 data and function members.

.cpp：具体实现

7.Scope Resolution Operator ( :: )：In the implementation file, the scope resolution operator is used in the heading before the function member’s nameto specify its class.

void  TimeType ::Write ( ) {           .  .  . }

8.Object Creation

class PlayingCard { … }aCard;
PlayingCard aCard; 
PlayingCard * pCard = new PlayingCard;