Re: memory leak detection techniques

Norbert Unterberg <nunterberg@newsgroups.nospam>
Thu, 11 Oct 2007 00:05:28 +0200
David Webber schrieb:

In my non-MFC DLL I have a global instance of an object of the form

CMyCollection : public std::vector<CMyThing>;

Its normal constructor is called on startup, which just creates and
empty collection.
It is only called once.
It is filled in (also once) with a method of CMyColllection
schematically of the form


   CMyThing thing;

   for( allthings )
       thing = .... // fill in the thing
       push_back( thing ); //*********

It is usually not changed, and lasts until the program shuts down.
It is never copied. (It has a copy constructor, because I feel nervous
without them, but it is never called.)
The destructor is called once, and just calls clear() (because I feel
it is neat to do so).

I am being told that the memory leak is associated with the CMyThing's
copy constructor invoked by push_back() above.

How can that be?

If the memory leak is associated with CMyThing's copy constructor then I guess
it contains some deep copy opearions? If you overrode the CMyThing's copy
constructor, did you also override it's assignment operator and destructor? See
the "Law of the Big Three".


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