我目前正在为学校项目设计C ++视频游戏。建议我们使用abstractfactory设计来创建我们的对象。
在玩游戏时，我想将对象（玩家，敌人，武器等）存储在一个完整的（超类）指针向量中。
我在GameLogic类中定义了关卡，但是当我尝试使用派生类填充矢量时，有时会出错，但有时却不会。
在此示例中，我添加了一些敌人，speedpowerups和healthpowerup。 SpeedPowerUp和HealthPowerUp相同，只是名称不同。
但是添加HealthPowerUp可行，但添加SpeedPowerUp不可行...
这些是我的代码中的一些片段：
一般的东西
typedef vector <Entitie*> container;
typedef vector <Entitie*>::iterator iter;
继承结构
class SDLSpeedPowerUp: public CDS::SpeedPowerUp....
class SpeedPowerUp: public CDS::PowerUp....
class PowerUp: public CDS::Entitie....
class SDLHealthPowerUp: public CDS::HealthPowerUp....
class HealthPowerUp: public CDS::PowerUp....
class SDLEnemy: public CDS::Enemy....
class Enemy: public CDS::Vehicle....
sdlfactory.h（一些代码）
class SDLFactory: public CDS::AbstractFactory {
public:
SDLFactory();
virtual ~SDLFactory();
...
Enemy* createEnemy(int,int,int,int,int,int,int,int);
...
HealthPowerUp* createHealthPowerUp(int,int,int);
SpeedPowerUp* createSpeedPowerUp(int,int,int);
...
};
sdlfactory.cpp（一些代码）
Enemy* SDLFactory::createEnemy(int x,int y,int maxHealth,int maxSpeed,int acceleration,int brakeSpeed,int damage,int bulletSpeed)
{
Waepon* loadedWaepon=createWaepon(x,y,damage,bulletSpeed);
return new SDLEnemy(x,y,maxHealth,maxSpeed,acceleration,brakeSpeed,loadedWaepon,this);
}
HealthPowerUp* SDLFactory::createHealthPowerUp(int x,int y,int effect){
return new SDLHealthPowerUp(x,y,effect,this);
}
SpeedPowerUp* SDLFactory::createSpeedPowerUp(int x,int y,int effect){
return new SDLSpeedPowerUp(x,y,effect,this);
}
gamelogic.h（一些代码）
class GameLogic
{
protected:
AbstractFactory* factory;
public:
GameLogic(AbstractFactory*);
virtual ~GameLogic();
void createLevel(container&, int);
};
gamelogic.cpp（一些代码）
void GameLogic::createLevel(container& entities,const int level){
srand(time(NULL));
//create enemies
int x=0;
int spawnRate=1000-25*level;
while((x+=rand()%(spawnRate))<MAXHEIGHT){
int y=rand()%MAXRIGHT;
int maxHealth=rand()%(100+10*level);
int speed=50+rand()%75;
int acceleration=5+rand()%10;
int brakeSpeed=10+rand()%15;
int damage=25+rand()%(15*level);
int waeponspeed=150+rand()%(150);
entities.push_back(factory->createEnemy(x,y,maxHealth,speed,acceleration,brakeSpeed,damage,waeponspeed));
}
x=0;
while((x+=rand()%spawnRate)<MAXHEIGHT){
int y=rand()%MAXRIGHT;
int effect=50+rand()%50;
//the following line of code gives me a compile error
entities.push_back(factory->createSpeedPowerUp(x,y,effect));
}
x=0;
while((x+=rand()%spawnRate)<MAXHEIGHT){
int y=rand()%MAXRIGHT;
int effect=50+rand()%50;
entities.push_back(factory->createHealthPowerUp(x,y,effect));
}
}
编译错误：
../GameLogic.cpp: In member function 'void CDS::GameLogic::createLevel(CDS::container&, int)':
../GameLogic.cpp:39: error: no matching function for call to 'std::vector<CDS::Entitie*, std::allocator<CDS::Entitie*> >::push_back(CDS::SpeedPowerUp*)'
/usr/include/c++/4.0.0/bits/stl_vector.h:602: note: candidates are: void std::vector<_Tp, _Alloc>::push_back(const _Tp&) [with _Tp = CDS::Entitie*, _Alloc = std::allocator<CDS::Entitie*>]
make: *** [GameLogic.o] Error 1
最佳答案
您正在尝试将SpeedPowerUp添加到Entitie的向量中。您可能要确保您的SpeedPowerUp实际上是从Entitie继承的。