6 "error LNK2019: unresolved external symbol" [closed] - c++

Question

This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center.
Closed 10 years ago.
I got 6 unresolved externals. I know what it means but I don't know how to fix it.
Collision.cpp
#include "Collision.h"
void Collision::Collide(Entity &entity1, Entity &entity2)
{
if(entity1.getX() + entity1.getWidth() > entity2.getX() ||
entity1.getX() < entity2.getX() + entity2.getWidth() ||
entity1.getY() + entity1.getHeight() > entity2.getY() ||
entity1.getY() < entity2.getY() + entity2.getHeight())
{
entity1.setX(entity1.getX());
entity1.setY(entity1.getY());
}
}
Collision.h
#ifndef COLLISION_H
#define COLLISION_H
#include "Map.h"
#include "Animation.h"
#include "Entity.h"
class Collision
{
public:
void Collide(Entity &entity1, Entity &entity2);
protected:
Map map;
};
#endif
Where collision is called
collision.Collide(player, enemy);
Entity.h
#ifndef Entity_H
#define Entity_H
#include<SFML/Graphics.hpp>
#include"Animation.h"
#include"Camera.h"
class Entity
{
public:
void Initialize();
void LoadContent();
void Update(sf::RenderWindow &Window);
void Draw(sf::RenderWindow &window);
void setX(float newX);
void setY(float newY);
int getHeight();
int getWidth();
float getX();
float getY();
private:
Camera camera;
float x, y;
int currentFrameX, currentFrameY;
sf::Clock clock;
};
#endif // Entity_H
Unresolved externals
1>Collision.obj : error LNK2019: unresolved external symbol "public: void __thiscall Entity::setX(float)" (?setX#Entity##QAEXM#Z) referenced in function "public: void __thiscall Collision::Collide(class Entity &,class Entity &)" (?Collide#Collision##QAEXAAVEntity##0#Z)
1>Collision.obj : error LNK2019: unresolved external symbol "public: void __thiscall Entity::setY(float)" (?setY#Entity##QAEXM#Z) referenced in function "public: void __thiscall Collision::Collide(class Entity &,class Entity &)" (?Collide#Collision##QAEXAAVEntity##0#Z)
1>Collision.obj : error LNK2019: unresolved external symbol "public: int __thiscall Entity::getHeight(void)" (?getHeight#Entity##QAEHXZ) referenced in function "public: void __thiscall Collision::Collide(class Entity &,class Entity &)" (?Collide#Collision##QAEXAAVEntity##0#Z)
1>Collision.obj : error LNK2019: unresolved external symbol "public: int __thiscall Entity::getWidth(void)" (?getWidth#Entity##QAEHXZ) referenced in function "public: void __thiscall Collision::Collide(class Entity &,class Entity &)" (?Collide#Collision##QAEXAAVEntity##0#Z)
1>Collision.obj : error LNK2019: unresolved external symbol "public: float __thiscall Entity::getX(void)" (?getX#Entity##QAEMXZ) referenced in function "public: void __thiscall Collision::Collide(class Entity &,class Entity &)" (?Collide#Collision##QAEXAAVEntity##0#Z)
1>Collision.obj : error LNK2019: unresolved external symbol "public: float __thiscall Entity::getY(void)" (?getY#Entity##QAEMXZ) referenced in function "public: void __thiscall Collision::Collide(class Entity &,class Entity &)" (?Collide#Collision##QAEXAAVEntity##0#Z)
Me thinks it's a problem with not overloading the Entity getX() etc. in the Player/Enemy class properly.

Answer 1

It turns out that Entity.cpp has not been included in my project.
Thanks chris and simonc!