Matrix assignment uses statements like "A=B;" where A and B are matrices. The operator is the function given by the code
void VMatrix::operator= (VMatrix &ROp)
{
Garbage("operator =");
ROp.Garbage("operator =");
Replace( ROp );
Dispatch->Cleanstack();
}
The operands are checked for validity. The left operand has
its header replaced. Then, any intermediate stack matrices
are removed from the stack.
Cleanstack() will be discussed in the chapter on the matrix
stack. Basically it serves to dispose of the intermediate
results of a repeated calculation. Suppose you use the
statement c=a+b+d . The sum b+d is calculated, then
added to a, and the result is assigned to c. The
intermediate calculation of b+d is still on the heap in the
stack. Cleanstack() removes b+d and
a+(b+d) from the stack.