类声明混乱-右括号和分号之间的名称 [英] Class declaration confusion - name between closing brace and semi-colon

问题描述

class CRectangle {
    int x, y;
  public:
    void set_values (int,int);
    int area (void);
  } rect;

在此示例中，在该类定义中，右括号后和分号之间的"rect"是什么意思?我很难找到明确的解释.另外:不管是什么，您也可以为结构体做吗?

In this example, what does 'rect' after the closing brace and between the semi-colon mean in this class definition? I'm having trouble finding a clear explanation. Also: Whatever it is, can you do it for structs too?

推荐答案

rect 是变量的名称(在这种情况下为对象).

rect is the name of a variable (an object in this case).

就像说过的话一样

  int rect;

除了代替 int 之外，还有一个新类型的定义，称为 CRectangle .通常，类类型是分别声明的，然后用作

except instead of int there is a definition of a new type, called a CRectangle. Usually, class types are declared separately and then used as

  CRectangle rect;

您可能很熟悉，但是在这样的声明中声明一个新类型是完全合法的.

as you are probably familiar with, but it's perfectly legal to declare a new type as part of a declaration like that.

是的，它适用于结构:

  struct SRectangle { int x, y; } rect;

实际上，如果您不打算再次使用该类型，则甚至不必给该类型起一个名字:

In fact you don't even have to give the type a name if you don't plan to use it again:

  struct { int x, y; } rect;

这被称为匿名结构"(它也适用于类).

that's called an "anonymous struct" (and it also works for classes).

这篇关于类声明混乱-右括号和分号之间的名称的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！