C++ : "new" gives me the same pointer twice

[Mihai Zaharescu]

Hi,
I'm not sure what's happening here:

Fereastra is an instance of fereastra allocated with new.

I don't remember deleting Fereastra. To be a bit more certain I used IsBadReadPtr to see if Fereastra is cleared, but it seams ok.

I want to allocate FereastraIcoana with new.

I end up with FereastraIcoana having the same address as Fereastra.

//test to see if Fereastra is ok	
if(IsBadReadPtr(Fereastra, 1))
{
	int i=0;    //breakpoint here, not entering
}

//allocate FereastraIcoana with new
FereastraIcoana=new fereastra(Fereastra->width()-2*bordura_icoana, Fereastra->height()-2*bordura_icoana);

//setting some values
FereastraIcoana->ascult_evenimente=false;
FereastraIcoana->move(bordura_icoana, bordura_icoana);
FereastraIcoana->SetMereuVizibila();

//here is the strange part, test to see if Fereastra (which was allocated sometime earlier) is at the same location as the newly allocated pointer
if(Fereastra==FereastraIcoana)
{
	int i=0;    //breakpoint here, enters here
}

no warnings, all values for Fereastra are valid and ok while debugging.

Do you have any ideas? It's the end of the day and I can't get any further with this error

I'm using Microsoft Visual c++ 2008

Thank you

[oracleguy]

Show where you allocate the memory for Fereastra and show us the implementation of IsBadReadPtr.

I would do more checking to be certain that you aren't deleting the Fereastra pointer at some point. You could put a breakpoint inside the destructor to know for sure.

[Mihai Zaharescu]

The code is to big to post here. That was my thought too, that I deleted the object somewhere... Thank you for the idea of a breakpoint inside the destructor, didn't think of that
That function (IsBadReadPtr) is a windows function. They say that it doesn't work for all pointers, but if it says it is bad, it is for sure bad

I don't know where the problem was, but I changed something from a vector of objects to a vector of pointers to objects and it seams to work now. Maybe the Fereastra class in which I am is read twice from that vectror... I hope it won't show up later...