hi,

i'm trying to use the CMap template, instantiating it like this:

CMap<char,char*,CString,CString*> map;

should these classes parameterising it be ok? i get an error from somewhere in the cmap code:

error C2664: 'SetAt' : cannot convert parameter 1 from 'char' to 'char *'

thanks.

I think I would have done it more like this


or, better yet:


You can do some reading here Template-based classes and here CMap Class.

If you would have posted your call to SetAt, I could have told you where exactly the problem is... Oh, well, I think it's more challenging to find it on your own (and you'll problably learn a lot more)

Best regards,
Luci

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ah but i havent called setAt yet..

thanks for the help though. this is going to make me sound very stupid now, but how is

char &

different to

char *

?

is the second one is a pointer and the first one is a reference? whats the difference?

Well, think of using functions. There is a distinctive difference on how you would use variables passed as pointers compared to those passed using references:


They are both passed by address, but inside the functions they are treated different. (Observe the *)
So, inside this template, methods like SetAt will be called, but they won't know how to deal with your data, sice they expect a reference type.

But did my previous post fix your problem?

Regards,
Luci

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yeah that explains it, the problem is fixed now.

thanks again.

Hi,

i'm trying to use CMap but i get some strange problems whit it. I have defined my variable as follows:

CMap <CString,LPCTSTR,CUser*,CUser*> m_umUsers;

I have my class CUser well done and I have a function called AddNewUser defined as follows:

void CVerificadorDoc::AddNewUser(CUser* pUser)
{
MessageBox(NULL, pUser->GetNick(), _T("New Register"),MB_ICONINFORMATION);
m_umUsers.SetAt((LPCTSTR)pUser->GetNick(), pUser);
SetModifiedFlag();

}

I call this function when I push a button in my dialog, the execution shows the messageBox correctly before the SetAt function but is there where nothing else happens. It never cames back to the calling function. I can not understand why, there isn't any error showed.

Is there anyone capable to explain me what to do or what is happening?

thank you very much in advance