D
David
Can anyone tell me why the following code crashes? The pure base
class StaticObjectRegistry stores pointers to derived classes upon
construction. Later it uses these pointers to call the overridden
function ClearStaticData() through its base function Handler(). That
is where the code crashes. (I'm using VC++6.0)
#include <iostream>
#include <list>
using namespace std;
class StaticObjectRegistry
{
public:
static list<StaticObjectRegistry*> objects;
StaticObjectRegistry() {
static bool registered;
if(!registered) {
objects.push_back(this);
registered = true;
}
};
static void ResetStaticObjects(void);
void Handler(void) {
ClearStaticData();
}
virtual void ClearStaticData(void) = 0;
};
list<StaticObjectRegistry*> StaticObjectRegistry:bjects;
void StaticObjectRegistry::ResetStaticObjects(void) {
for(list<StaticObjectRegistry*>::iterator i = objects.begin(); i !=
objects.end(); i++)
(*i)->Handler();
}
class P : public StaticObjectRegistry {
public:
void ClearStaticData(void) {cout << "In p.clear" << endl; c = 0;}
static int c;
P() {c++; cout << "P: " << c << endl;};
};
int P::c;
void main()
{
P p;
p.ResetStaticObjects();
}
class StaticObjectRegistry stores pointers to derived classes upon
construction. Later it uses these pointers to call the overridden
function ClearStaticData() through its base function Handler(). That
is where the code crashes. (I'm using VC++6.0)
#include <iostream>
#include <list>
using namespace std;
class StaticObjectRegistry
{
public:
static list<StaticObjectRegistry*> objects;
StaticObjectRegistry() {
static bool registered;
if(!registered) {
objects.push_back(this);
registered = true;
}
};
static void ResetStaticObjects(void);
void Handler(void) {
ClearStaticData();
}
virtual void ClearStaticData(void) = 0;
};
list<StaticObjectRegistry*> StaticObjectRegistry:bjects;
void StaticObjectRegistry::ResetStaticObjects(void) {
for(list<StaticObjectRegistry*>::iterator i = objects.begin(); i !=
objects.end(); i++)
(*i)->Handler();
}
class P : public StaticObjectRegistry {
public:
void ClearStaticData(void) {cout << "In p.clear" << endl; c = 0;}
static int c;
P() {c++; cout << "P: " << c << endl;};
};
int P::c;
void main()
{
P p;
p.ResetStaticObjects();
}