我在 C++ 中有以下文件:
对象.h:
class Object{
public:
Object(void);
~Object(void);
GLfloat getLeft();
GLfloat getRight();
GLfloat getBottom();
GLfloat getTop();
};
播放器.h:
class Player : public Object{
public:
Player(void);
~Player(void);
GLfloat getLeft();
GLfloat getRight();
GLfloat getBottom();
GLfloat getTop();
};
平台.h:
class Platform : public Object{
public:
Platform(void);
~Platform(void);
GLfloat getLeft();
GLfloat getRight();
GLfloat getBottom();
GLfloat getTop();
};
支柱.h:
class Pillar : public Object{
public:
Pillar(void);
~Pillar(void);
GLfloat getLeft();
GLfloat getRight();
GLfloat getBottom();
GLfloat getTop();
};
碰撞.h:
#include "Player.h"
#include "Platform.h"
#include "Pillar.h"
class Collision
{
public:
Collision(void);
~Collision(void);
bool CollisionDetect(Object* obj1, Object* obj2);
};
碰撞.cpp:
bool Collision::CollisionDetect(Object* obj1, Object* obj2){
return !(obj2->getLeft() > obj1->getRight()
|| obj2->getRight() < obj1->getLeft()
|| obj2->getTop() > obj1->getBottom()
|| obj2->getBottom() < obj1->getTop());
}
CollisionDetect 将比较 2 个不同的对象是否发生碰撞,为此我需要特定的 x 和 y 值,但是,对象的类型可能会根据不同的情况而有所不同,并且每种类型的对象将有不同的方法来找到它们的 x 和 y 值. 这意味着我不得不在它们的子类中重新定义相关的 get 方法,但是当我运行这段代码时,我最终会遇到错误:
1>Collision.obj : error LNK2019: unresolved external symbol "public: float __thiscall Object::getLeft(void)" (?getLeft@Object@@QAEMXZ) referenced in function "public: bool __thiscall Collision::CollisionDetect(class Object *,class Object *)" (?CollisionDetect@Collision@@QAE_NPAVObject@@0@Z)
1>Collision.obj : error LNK2019: unresolved external symbol "public: float __thiscall Object::getRight(void)" (?getRight@Object@@QAEMXZ) referenced in function "public: bool __thiscall Collision::CollisionDetect(class Object *,class Object *)" (?CollisionDetect@Collision@@QAE_NPAVObject@@0@Z)
1>Collision.obj : error LNK2019: unresolved external symbol "public: float __thiscall Object::getBottom(void)" (?getBottom@Object@@QAEMXZ) referenced in function "public: bool __thiscall Collision::CollisionDetect(class Object *,class Object *)" (?CollisionDetect@Collision@@QAE_NPAVObject@@0@Z)
1>Collision.obj : error LNK2019: unresolved external symbol "public: float __thiscall Object::getTop(void)" (?getTop@Object@@QAEMXZ) referenced in function "public: bool __thiscall Collision::CollisionDetect(class Object *,class Object *)" (?CollisionDetect@Collision@@QAE_NPAVObject@@0@Z)
1>C:\Users\Student\Dropbox\Work\Year 2\Graphics 1\Coursework\GraphicsCoursework\Debug\GraphicsCoursework.exe : fatal error LNK1120: 4 unresolved externals
是我的继承问题导致了这种情况,还是其他原因?