Hi community
First I want to thank everyone who will look through this, because it's a longer post.
I'm currently reading a book on AI by Mat Buckland.
I'm re-building Mats entitymanager, though I just copied it.
He used std::map to collect all entities as pointers which are cross referenced by their unique ID.
While I'm inserting such entity in a std::map the code fails and makes the program crash.
Because I can suppose it's a error from one of my class (since I'm doing a lot inheritance-stuff and with simple classes inserting works) I will post here my class tree of the entity-class I want to store in the map.
// A quik intro how my tree is build
// a class with drawing functions (SFML)
class gfxEntity
// a base class for all entities (containing position velocity ...)
class BaseGameEntity : public gfxEntity
// a class which should have AI and drawing methods
class BattleEntity : public BaseGameEntity gfxEntity.h
#include "Render/Render.h"
#include "Render/GFXLIB.h"
class gfxEntity
{
protected : // Since inheritance must have access to it
int m_iFrame;
int m_iFrameIdleTime;
float width,height;
// Pixel holder
sf::Sprite m_Sprite;
sf::Image m_Image;
BITMAP_RECTANGLE m_vFrameData[ FRAMES_MAX ]; //Contains 4 ints describing a rectangle
// Points to the App, which allows us drawing methods (SFML)
sf::RenderWindow* m_pRender;
// Frame preparation will move the sprite to the correct position
virtual void FramePreparation() = 0;
// Calculates frames on an image and store them in Framedata
virtual void InitialiseFrames() = 0;
// Draws the sprite with currently selected frame
virtual void Draw() = 0;
public:
// The current frame will be selected to be drawn on screen
void SetSub();
}; gfxEntity.cpp (Only defines SetSub) BaseGameEntity.h
class BaseGameEntity : public gfxEntity // inhertitates drawing functions
{
private :
// ...
protected :
// Is defined in the cpp
virtual void FramePreparation();
// Is dependent on the class => so leave modifyable
virtual void InitialiseFrames() = 0;
public:
// Can dependent on the class => same as above
virtual void Draw();
BaseGameEntity()
{
SetID(m_iNextValidID);
}
virtual ~BaseGameEntity(){}
//all entities must implement an update function
virtual void Update()=0;
//all entities can communicate using messages. They are sent
//using the MessageDispatcher singleton class
//NOT IMPLEMENTED YET
virtual bool HandleMessage(const Telegram& msg)=0; BaseGameEntity.cpp
#include "Entity/BaseEntity.h"
void BaseGameEntity::FramePreparation()
{
m_Sprite.SetPosition(m_vPosition.x,m_vPosition.y);
}
void BaseGameEntity::Draw()
{
if (m_pRender) {
// First set the position of the sprite
FramePreparation();
// Then draw it SFML-like
m_pRender->Draw(m_Sprite);
}
} BattleEntity.h
class BattleEntity : public BaseGameEntity
{
private :
// ...
protected :
// No virtual since there will be no more inheritance above BattleEntity
void FramePreparation();
void InitialiseFrames();
void Draw();
public :
//this must be implemented (no more virtual)
void Update();
bool HandleMessage(const Telegram& msg){return false;} // no more virtual
~BattleEntity(){delete m_pStateMachine;} BattleEntity.cpp
#include "Entity/BattleEntity.h"
void BattleEntity::FramePreparation()
{
BaseGameEntity::FramePreparation(); // No need to change the function yet
}
void BattleEntity::Draw()
{
BaseGameEntity::Draw(); // No need to change the function yet
}
void BattleEntity::Update()
{
m_pStateMachine->Update(); // AI thingies
// Test if it works (should move slightly to the right)
SetPosition(Position() + vec2(0.02f,0.0));
}Whats not working :
typedef std::map<int, BaseGameEntity*> EntityMap;
EntityMap m_EntityMap;
//...
void EntityManager::RegisterEntity(BaseGameEntity* NewEntity)
{
printf("INSERTING");
std::pair<int,BaseGameEntity*> test = std::make_pair(NewEntity->ID(), NewEntity); // Works just fine
m_EntityMap.insert(test); // Meh crashes no INSERTED is printed
printf("INSERTED");
}I am quite educated with inheritance with virtual methods but not well enough with std::maps, though I know std::vector well, which is kinda the same.
I am sure, that the error occurs because I use virtual function.
I'd really appreciate every tip on this error : D
If someone is interested , I uploaded this project on MU.
(www.megaupload.com/?d=DOUAFJEE)