Output from BUG0796.CPP:

Even though A has no data members, it
still has to occupy a minimum of one
byte according to the C++ standard.
Class B has a single pointer, so under a
32 bit programming model, it should be
exactly four bytes larger.
Unfortunately, VC++ forgets to add that
extra byte from the base class:

sizeof( A ) = 1  sizeof( B ) = 4

As the two constructors are called, note
the addresses of the two memory buffers
that have been allocated for the names
of the objects:

in ctor p = 0x00650540, name = object b1
in ctor p = 0x00650648, name = object b2

When the assignment operator is
invoked, the buffer values for this and
that should match what you see printed
out from the constructors:

buffer::operator=( that ) that.p  = 0x00650540, object b1
                          this->p = 0x00650640,

Since the pointer has been mangled,
expect a GPF upon exit!