错误：类后使用typedef名称

问题描述

我无法弄清楚这是什么实际问题。

I can't figure out what the actual problem is with this.

typedef struct _actor
{
   ...
} _actor, Actor;

class Actor
{
   ...
};

我得到这个奇怪的错误信息 actor.cpp：31：error：using typedef-name'Actor'after'class'。

I get this weird error message actor.cpp:31: error: using typedef-name ‘Actor’ after ‘class’.

任何想法我在这里做错了什么？谢谢：）

Any idea what I did wrong here? Thank you :)

推荐答案

不允许定义符号 Actor 不止一次。 typedef 语句已定义作为的别名的符号 Actor struct _actor 在尝试声明一个具有相同名称的类之前。

You are not allowed to define the symbol Actor more than once. The typedef statement already defines the symbol Actor as an alias for struct _actor before you attempt to declare a class with the same name.

我猜你正在使用 gcc 编译器。在使用 gcc 编译时，会出现以下错误：

I'm guessing you're using the gcc compiler. I get the following errors when I compile with gcc:

../src/main.cpp:113: error: using typedef-name ‘Actor’ after ‘class’
../src/main.cpp:111: error: ‘Actor’ has a previous declaration here

第一条消息（指向 class Actor 程序）声明，你不能声明一个类与 typedef名称（ Actor 已声明使用 typedef ）。第二个消息（指向程序中的 typedef struct _actor 行）稍微清楚一些，指的是 Actor 。

The first message (pointing the class Actor line in the program) states that you cannot declare a class with a typedef-name (Actor is already declared using typedef). The second message (pointing to the typedef struct _actor line in the program) is a little clearer and refers to the multiple declarations for Actor.

在C / C ++中，对于类似这样的单一类错误导致多个编译器错误是非常常见的，通常更有帮助的消息不是第一次报告。

It is very common in C/C++ for a single class of error like this to result in multiple compiler errors and often the more helpful message is not the first reported.

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