invalid cast of an rvalue expression

[adam99 <adamquestion@xxxxxxxxx>]

I am getting a following error on g++ 4.1.2


SqMatrix.h: In member function 'SqMatrix SqMatrix::operator*(const
SqMatrix&) const':
SqMatrix.h:91: error: invalid cast of an rvalue expression of type 'Matrix'
to type 'const SqMatrix&'


for the following code segment

     SqMatrix  operator * (const SqMatrix &sm) const {
         return (const SqMatrix &) (*(Matrix *)this * sm); }


this error did not seem to appear on g++ 3.4.6. Do you know what could be
the problem?

Thanks



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