为什么我必须在C ++的类声明的末尾添加一个分号？ [英] Why must I put a semicolon at the end of class declaration in C++?

问题描述

在C ++类声明中：

  class Thing 
 {
 ... 
}; 
  

为什么必须包含分号？

解决方案

完整的语法基本上是

class NAME {constituents}实例;

其中constituents是类元素和方法的序列，instances是类（即对象）的实例的逗号分隔列表。

示例：

  class FOO {
 int bar; 
 int baz; 
} waldo; 
  

声明类FOO和对象waldo。

实例序列可能为空，在这种情况下，您只需要

  class FOO {
 int酒吧; 
 int baz; 
}; 
  

你必须把分号放在那里，以便编译器知道你是否声明了任何实例。 / p>

这是一个C兼容性的东西。

In a C++ class declaration:

class Thing
{
    ...
};

why must I include the semicolon?

解决方案

The full syntax is, essentially,

class NAME { constituents } instances ;

where "constituents" is the sequence of class elements and methods, and "instances" is a comma-separated list of instances of the class (i.e., objects).

Example:

class FOO {
  int bar;
  int baz;
} waldo;

declares both the class FOO and an object waldo.

The instance sequence may be empty, in which case you would have just

class FOO {
  int bar;
  int baz;
};

You have to put the semicolon there so the compiler will know whether you declared any instances or not.

This is a C compatibility thing.

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