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Something really strange in the parameter list of a member function !

akilguo (43)
This declaration is in the class definition, and it appears very strange!
1
2
 
ostream& print( ostream &os = *_current_os,
                    void (BinaryTree<elemType>::*traversal)( ostream& ) const = &BinaryTree<elemType>::inorder ) const;


What does the second parameter mean? Actually, the " *traversal" doesn't exist in the class definition, it occurs all of sudden! Can you explain?
Thank, Folks!
Last edited on
Bazzy (6281)
It's a pointer to member function, 'traversal' is the name of the parameter, not a member of BinaryTree.
This may be one of the most complex things in C++ grammar
akilguo (43)
Oh, I see, thanks ,man!
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