this pointer

[stub]

Some questions about "this" pointer:

1. To make an assignment function,

Stribg &String::operat or=(const String &other)
{
...
return *this;
}

I have hard time to understand why "*this" matches a "String &" here. Could
someone shed some light on this?

2. In a static member function aren't there "this" pointer accessible inside
it?

3. In a const member function is the "this" pointer of const type while
non-const type in a non-const member?

Thanks in advance!

[Ali R.]

Re: this pointer

> Some questions about "this" pointer:[color=blue]
>
> 1. To make an assignment function,
>
> Stribg &String::operat or=(const String &other)
> {
> ...
> return *this;
> }[/color]

The return type is a String & (String reference) and the assignment
operator is passing back a reference to itself one the assignment is done.[color=blue]
>
> I have hard time to understand why "*this" matches a "String &" here.[/color]
Could[color=blue]
> someone shed some light on this?
>
> 2. In a static member function aren't there "this" pointer accessible[/color]
inside[color=blue]
> it?[/color]

No there is no this pointer in a static member function.[color=blue]
>
> 3. In a const member function is the "this" pointer of const type while
> non-const type in a non-const member?
>[/color]
Yes the this pointer is a const pointer in a const member function.
[color=blue]
> Thanks in advance!
>
>
>
>
>
>[/color]

[Jacek Dziedzic]

Re: this pointer

"stub" <stub@asof.co m> wrote in message news:1qzob.2275 3
$Ec1.2015438@bg tnsc05-news.ops.worldn et.att.net...[color=blue]
> Some questions about "this" pointer:
>
> 1. To make an assignment function,
>
> Stribg &String::operat or=(const String &other)
> {
> ...
> return *this;
> }
>
> I have hard time to understand why "*this" matches a
> "String &" here. Could someone shed some light on this?[/color]

You return *this in an assignment operator so that
it's possible to do things like:

a=b=c; // a,b,c are String's and
// b returns (*this) so that a can be assigned
[color=blue]
> 2. In a static member function aren't there "this" pointer
> accessible inside it?[/color]

Static methods have no "this" pointer, because they
are not associated with a particular instance of an object.

HTH,
- J.