Cocos2d-x中如何声明CCInteger成员变量?

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Cocos2d-x中如何声明CCInteger成员变量?

下面这个类在Xcode中可以编译通过.

  class Game : public CCLayer
  

  {
  

  private:
  

  

  CCInteger mDirectionUp = CCInteger(TANK_CONTROL_MOVE_UP);
  

  CCInteger mDirectionRight = CCInteger(TANK_CONTROL_MOVE_RIGHT);
  

  CCInteger mDirectionDown = CCInteger(TANK_CONTROL_MOVE_DOWN);
  

  CCInteger mDirectionLeft = CCInteger(TANK_CONTROL_MOVE_LEFT);
  

  

  };

但是Eclipse为Android中编译通不过.

报错:

  jni/../../Game/Game.h:64:60: error: a call to a constructor cannot appear in a constant-expression
  

  jni/../../Game/Game.h:64:60: error: ISO C++ forbids initialization of member 'mDirectionUp' [-fpermissive]
  

  jni/../../Game/Game.h:64:60: error: making 'mDirectionUp' static [-fpermissive]
  

  jni/../../Game/Game.h:64:60: error: invalid in-class initialization of static data member of non-integral type 'cocos2d::CCInteger'
  

  jni/../../Game/Game.h:65:66: error: a call to a constructor cannot appear in a constant-expression
  

  jni/../../Game/Game.h:65:66: error: ISO C++ forbids initialization of member 'mDirectionRight' [-fpermissive]
  

  jni/../../Game/Game.h:65:66: error: making 'mDirectionRight' static [-fpermissive]
  

  jni/../../Game/Game.h:65:66: error: invalid in-class initialization of static data member of non-integral type 'cocos2d::CCInteger'
  

  jni/../../Game/Game.h:66:64: error: a call to a constructor cannot appear in a constant-expression
  

  jni/../../Game/Game.h:66:64: error: ISO C++ forbids initialization of member 'mDirectionDown' [-fpermissive]
  

  jni/../../Game/Game.h:66:64: error: making 'mDirectionDown' static [-fpermissive]
  

  jni/../../Game/Game.h:66:64: error: invalid in-class initialization of static data member of non-integral type 'cocos2d::CCInteger'
  

  jni/../../Game/Game.h:67:64: error: a call to a constructor cannot appear in a constant-expression
  

  jni/../../Game/Game.h:67:64: error: ISO C++ forbids initialization of member 'mDirectionLeft' [-fpermissive]

如果修改成:
CCInteger mDirectionUp;
CCInteger mDirectionRight;
CCInteger mDirectionDown;
CCInteger mDirectionLeft;
则报错:
jni/../../Game/Game.h:18:7: error: no matching function for call to 'cocos2d::CCInteger::CCInteger()'

请问该如何解决此问题? 谢谢.

cocos2d-x C++

11 years, 10 months ago

Wei-Z

Wei-Z 11 years, 10 months ago

好吧, 这个是我C++不过关, 我自己贴出答案.

因为CCInteger没有默认的构造函数. 所以类Game的构造函数中必须对其进行初始化.
下面这个写法, 在Xcode, 和Eclipse都编译通过.

  //in Game.h
  

  class Game : public CCLayer
  

  {
  

  public:
  

  Game();
  

  private:
  

  

  CCInteger mDirectionUp;
  

  CCInteger mDirectionRight;
  

  };
  

  

  //in Game.cpp:
  

  Game::Game() : mDirectionUp(0), mDirectionRight(0)
  

  {
  

  

  }

answered 11 years, 10 months ago

brenden

brenden answered 11 years, 10 months ago