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GCC 4.1.0 issued the same error msg.

Thanks for your help!

Although gcc v.4.1.0 issued an error while compiling, VC 2005 and RVDS works properly with this. Would u please kindly try compiling the attached file?

I'm wondering now if it is a compiler...

After reading the section on friend functions and claases, I know that when u declare a firend class, u must cite explicitely:


class A ; // forward declaration

class B {
friend class A ;...