为什么我得到这个“枚举”不是类或命名空间错误？ [英] Why am I getting this 'enum' is not a class or a namespace error?

问题描述

  void createPlayer（Player& player，PlayerType& playerType ）; 
  

我有一个像这样定义的玩家：

  using namespace std; 
 
枚举PlayerType {FORWARD，DEFENSEMAN，GOALIE}; 
 
 class Player {
 public：
 Player（）; 
 void setType（PlayerType）; 
 private：
 PlayerType类型; 
}; 
  

这是我如何在main ...中调用方法...

  #includePlayer.h
 #includeManager.h
 
 int main（）{$ b经理经理
 
 $ b玩家玩家; 
 PlayerType t = PlayerType :: FORWARD; 
 manager.createPlayer（player，t）; 
 
 return 0; 
} 
  

...但是无法使用此错误进行编译：

  Main.cc：在函数'int main（）'中：
 Main.cc:12:18：error：'PlayerType'不是一个类或命名空间
  

任何想法？注意：我无法更改createPlayer方法的签名。

解决方案

枚举不创建命名空间。

因此 PlayerType t = PlayerType :: FORWARD; 应更改为：

  PlayerType t = FORWARD; 
  

---

请注意，c ++ 11介绍枚举类 es，它们有一个命名空间。除此之外，MSVC还有一个扩展名，可以处理（常规）枚举，就像他们有命名空间一样。所以你的代码实际上可以用MSVC。

I need call a method with this signature in my Manager class:

void createPlayer(Player& player, PlayerType& playerType);

I have a Player defined like so:

using namespace std;

enum PlayerType { FORWARD, DEFENSEMAN, GOALIE };

class Player {
  public:
    Player();
    void setType(PlayerType);
  private:
    PlayerType type;
};

This is how I try to call the method in main ...

#include "Player.h"
#include "Manager.h"

int main() {

  Manager manager;
  Player player;
  PlayerType t = PlayerType::FORWARD;
  manager.createPlayer(player, t);

  return 0;
}

... but it fails to compile with this error:

Main.cc: In function ‘int main()’:
Main.cc:12:18: error: ‘PlayerType’ is not a class or namespace

Any ideas? Note: I cannot change the signature of the createPlayer method.

解决方案

enum doesn´t create a namespace.

Therefor PlayerType t = PlayerType::FORWARD; should be changed to:

PlayerType t = FORWARD;

---

Notice that c++11 introduce enum classes, which have a namespace. Beside this MSVC has an extension which treats (regular) enums like they have namespace. So your code should actually work with MSVC.

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