Berkeley DB Family

The problem is when BDB is linked into an application built with VS8, deleting some BDB objects results in mixing memory managers and application crashes.

That is, if BDB is built with VS6, the BDB DLL will use VS6's new and delete operators. If the application that uses BDB is built with VS8 its objects will be allocated using VS8's new and delete:

DbSequence *seq = new DbSequence(db, 0);
...
delete seq;

The first line calls application's new and then the DbSequence constructor. The second line, on the other hand, calls the destructor, which in turn calls the operator delete (Microsoft's "scalar deleting destructor"). The destructor resides in the BDB DLL, so the delete call is made in the context of the DLL, trying to delete the memory block that was allocated by the executable.