Urgent Help Me!!!

[Ambili]

Hi,

I'm facing in a problem in the declaration of CList. Can you please tell me how to declare a CList object and use it.


Thanks in advance,

Ambili.

[Daren Chandisingh]

Can you be more specific? I'm not overly familair with template classes, but I would use a CList something like this:

// first declare a CList that sores char pointers and

// returns char pointers as references to the stored items

CList <char *, char *>myList(10);

// add some char * values and store their positions in the list

POSITION p1 = myList.AddTail( (char*) "Hello ");

POSITION p2 = myList.AddTail( (char*) "World ");

// now I'm able to extract the values and use them

char s[50];

sprintf (s,"%s%s", myList.GetAt(p1),myList.GetAt(p2));

SetWindowText(_T(s));




I hope that is of some help to you.

[Ambili]

Hi,

Thanx for the information. But what i would like to know is what is the

significance of the parameters that we are passing while declaring

the CList object. But the code which i'm working now has the following

declaration:

CList m_nList;


But it gives an compilation error saying that :

" ; not found before > ".


Can you please explain this.


Thanks,

Ambili.

[lin]

do you include the correct headfile?

[Dan O'Brien]

The CList template container always takes two parameters as Daren showed:


CList m_nList;


CList is just a template, so it's not complete unless its 'type' is specified, in this case char*. If you are storing CFoos in the list, it would look like CList m_nList.

[Franky Braem]

CList is a template class.

The declarations is as follows :

template <class TYPE, class ARG_TYPE>

class CList : public CObject

{

...

};

TYPE is the type of the object to store.

ARG_TYPE is the type used to reference objects in the list.

When you want a list for char's then your declaration can be as follows :

CList<char *, char *> MyList;


A list of persons could be :


CList<CPerson, CPerson &> MyList;

[Daren Chandisingh]

The declaration of a CList object requires that you

fill in the two parts of the template (because CList

is a template class). So, you can use


CList myList(10);


The first "char *" states that the list holds pointers

to char, and the second states that the list references

these as pointers to char. That might be confusing, but

that's how I understand it. The (10) is a parameter

that you can pass to the constructor that means "when this

list gets full, grow its space enough for ten more elements".

[Dan O'Brien]

How'd you get the brackets to show above? In my previous post, the brackets and everything between them was deleted from my message.

[Franky Braem]

I don't know what you mean. I just typed the message in the Message Box

and posted.

[Gomez Addams]

I have noticed this also. Sometimes, a post appears as if it

were straight HTML (such as yours). Other times it appears

as if it has the pre tag applied. I have not figured out

drives this.