queue push crashes
I am getting this message on queue push:
Access violation reading location 0xffffffffffffffff
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I don't understand why, so i don't know how to fix it.
This is the minimal code that reproduces the problem.
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#include <iostream>
#include <vector>
#include <queue>
#include <conio.h>
enum EEventType
{
EET_BUTTON_PRESSED = 0
};
struct Message
{
int id;
EEventType msg;
};
class IEventHandler
{
public:
virtual ~IEventHandler() {}
virtual void onEvent(const Message& msg) = 0;
};
class GUIManager;
class GUIElement
{
protected:
GUIManager* mgr;
int id;
public:
GUIElement(GUIManager* _mgr, int _id) : id(_id) {}
virtual ~GUIElement() {}
virtual void onMouseUp() {}
};
class GUIButton : public GUIElement
{
public:
GUIButton(GUIManager* _mgr, int _id) : GUIElement(_mgr, _id) {}
void onMouseUp();
};
class GUIManager
{
private:
IEventHandler* eventHandler;
std::queue<Message> qMsg;
std::vector<GUIElement*> vElements;
public:
GUIManager(IEventHandler* eh)
: eventHandler(eh)
{
}
~GUIManager()
{
for(std::size_t i = 0; i < vElements.size(); ++i)
{
delete vElements[i];
}
vElements.clear();
}
void addMessage(Message msg)
{
qMsg.push(msg);
}
GUIButton* addButton(int _id)
{
GUIButton* bttn = new GUIButton(this, _id);
vElements.push_back(bttn);
return bttn;
}
void update()
{
if(eventHandler)
{
while(!qMsg.empty())
{
eventHandler->onEvent(qMsg.front());
qMsg.pop();
}
}
}
};
void GUIButton::onMouseUp()
{
Message m;
m.id = id;
m.msg = EET_BUTTON_PRESSED;
mgr->addMessage(m);
}
class MyEventHandler : public IEventHandler
{
public:
void onEvent(const Message& msg)
{
std::cout << "Button: " << msg.id << " was pressed!" << std::endl;
}
};
int main()
{
MyEventHandler meh;
GUIManager mgr(&meh);
GUIButton* bttn1 = mgr.addButton(22);
GUIButton* bttn2 = mgr.addButton(34);
while(true)
{
mgr.update();
if(_kbhit())
{
char c;
std::cin >> c;
if(c == 'a')
{
bttn1->onMouseUp();
}
else if(c == 's')
{
bttn2->onMouseUp();
}
else if(c == 'q')
{
break;
}
}
}
return 0;
}
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Thank you for your time.
The GUIElement constructor doesn't initialize mgr.
Yes, thats it, love you man. Thank you very much.
I don't know how did i overlooked that.
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