address of class from within class method

[peregrine_falcon12]

Is there a way to get a pointer to a class from inside one of the
class's methods?

[mlimber]

pe****************@hotmail.com wrote:

Is there a way to get a pointer to a class from inside one of the
class's methods?

Every class can refer to itself by a "this" pointer. Look it up in your
favorite C++ book.

Cheers! --M

[red floyd]

pe****************@hotmail.com wrote:

Is there a way to get a pointer to a class from inside one of the
class's methods?

What do you mean by a "pointer to a class"? A class is not an object,
it is a type. You can get a pointer to the current object by using the
keyword "this".

[red floyd]

mlimber wrote:

pe****************@hotmail.com wrote:

Is there a way to get a pointer to a class from inside one of the
class's methods?

Every class can refer to itself by a "this" pointer. Look it up in your
favorite C++ book.

No, every *object* can refer to itself by a "this" pointer. A class is
not an object, and therefore doesn't have an address, which a pointer
can point to.

[red floyd]

red floyd wrote:

pe****************@hotmail.com wrote:

Is there a way to get a pointer to a class from inside one of the
class's methods?

What do you mean by a "pointer to a class"? A class is not an object,
it is a type. You can get a pointer to the current object by using the
keyword "this".

Foot note: A class is a type, see 3.9.2/1

[peregrine_falcon12]

red floyd wrote:

What do you mean by a "pointer to a class"? A class is not an object,
it is a type. You can get a pointer to the current object by using the
keyword "this".

I meant an instance of a class.

Will the keyword "this" give me the address of the instance of the
class that called the class method which is using the keyword "this"?

[Andre Kostur]

On Fri, 02 Jun 2006 12:56:33 -0700, peregrine_falcon12 wrote:

Is there a way to get a pointer to a class from inside one of the class's
methods?

This may sound like nitpicking... but a class doesn't have an address. A
class merely describes what an object will "look like". _Instances_ of a
class have addresses.

So, could you restate your question?

[peregrine_falcon12]

Andre Kostur wrote:

On Fri, 02 Jun 2006 12:56:33 -0700, peregrine_falcon12 wrote:

Is there a way to get a pointer to a class from inside one of the class's
methods?

This may sound like nitpicking... but a class doesn't have an address. A
class merely describes what an object will "look like". _Instances_ of a
class have addresses.

So, could you restate your question?

I meant an instance of a class.

[Noah Roberts]

pe****************@hotmail.com wrote:

red floyd wrote:

What do you mean by a "pointer to a class"? A class is not an object,
it is a type. You can get a pointer to the current object by using the
keyword "this".

I meant an instance of a class.

Will the keyword "this" give me the address of the instance of the
class that called the class method which is using the keyword "this"?

no.

[mlimber]

pe****************@hotmail.com wrote:

Will the keyword "this" give me the address of the instance of the
class that called the class method which is using the keyword "this"?

Your phrase "the instance of the class that called the class method" is
not clear. Consider this:

struct A;

void Baz( A* ) {}

struct A
{
void Foo() { Baz( this ); } // Ok
};

struct B
{
void Bar( A& a )
{
a.Foo(); // Ok
Baz( this ); // Error
}
};

int main()
{
A a;
B b;
b.Bar( a );
}

In this example, the class instance that calls A::Foo() is an instance
of B. Within A::Foo(), "this" refers to an A object. Within B::Bar(),
"this" points to a B object, which is why the call to Baz generates an
error in B::Bar().

Cheers! --M

[mlimber]

red floyd wrote:

mlimber wrote:

pe****************@hotmail.com wrote:

Is there a way to get a pointer to a class from inside one of the
class's methods?

Every class can refer to itself by a "this" pointer. Look it up in your
favorite C++ book.

No, every *object* can refer to itself by a "this" pointer. A class is
not an object, and therefore doesn't have an address, which a pointer
can point to.

Sorry. I got typing too quickly.

Cheers! --M

[peregrine_falcon12]

Problem Solved!!!

Thanx mlimber!

[Andre Kostur]

On Fri, 02 Jun 2006 13:30:21 -0700, peregrine_falcon12 wrote:

Andre Kostur wrote:

On Fri, 02 Jun 2006 12:56:33 -0700, peregrine_falcon12 wrote:

> Is there a way to get a pointer to a class from inside one of the
> class's methods?

This may sound like nitpicking... but a class doesn't have an address.
A class merely describes what an object will "look like". _Instances_
of a class have addresses.

So, could you restate your question?

I meant an instance of a class.

OK, from inside any of your methods (except static methods), they all have
a pointer called "this" which points to the instance on which this method
was invoked.