Inserting into a vector can sometimes cause the entire vector to
reallocate itself. The insert() function returns a pointer to the
caller, so this reallocation could invalidate the returned pointer.
This is not what we want.
Instead, store pointers to the data in the vector. C++ provides a
default copy constructor that can be used to allocate a new item before
inserting. By doing it this way callers won't have to allocate memory
themselves. In addition, I will no longer need to keep a valid bit
since we can simply check for a NULL entry in the database.
Signed-off-by: Anna Schumaker <anna@ocarinaproject.net>
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