Calling through pointers to member functions

[Timothy Madden]

[cross-posted]

Hi

If I have a pointer to one of my member functions, and the pointer is also a
member, in the same class, should 'this->' not be used implicitly in the
class scope to call the pointed function ?

Something like this:

class MbxAddress
{
protected:
void LocateAnyMbx()
{
}

void LocateUserMbx()
{
}

public:
void (MbxAddress::*L ocateMbx)();
MbxAddress(bool fManagers = true)
{
if (fManagers)
LocateMbx = &MbxAddress::Lo cateAnyMbx;
else
LocateMbx = &MbxAddress::Lo cateUserMbx;
LocateMbx();
}
};

Here the last call 'LocateMbx()' should work without explicitly writing
(this->*LocateMbx)( );
because 'this->' is implicit in class scope and
dereferencing the function pointer to call the referred function is also
implicit
anyway.

Of course in total there should be two uses of 'this->' here:
- one for the pointer itself since it is a member
- one for the refered function since it must be applied on an object to be
called

I think it would be natural for both uses to be implicit here.
Please, anyone wants to comment on this ?

Timothy Madden
Romania



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[Victor Bazarov]

Re: Calling through pointers to member functions

"Timothy Madden" <batman@rmv.spa m.home.ro> wrote...[color=blue]
> If I have a pointer to one of my member functions, and the pointer is also
> a
> member, in the same class, should 'this->' not be used implicitly in the
> class scope to call the pointed function ?[/color]

You shouldn't confuse two syntaxes: this-> and this->*. They are different,
they have different purpose, and while the former is not always required,
the latter is required _always_ to call a function through a pointer to
a member.
[color=blue]
>
> Something like this:
>
> class MbxAddress
> {
> protected:
> void LocateAnyMbx()
> {
> }
>
> void LocateUserMbx()
> {
> }
>
> public:
> void (MbxAddress::*L ocateMbx)();
> MbxAddress(bool fManagers = true)
> {
> if (fManagers)
> LocateMbx = &MbxAddress::Lo cateAnyMbx;
> else
> LocateMbx = &MbxAddress::Lo cateUserMbx;
> LocateMbx();
> }
> };
>
> Here the last call 'LocateMbx()' should work without explicitly writing
> (this->*LocateMbx)( );
> because 'this->' is implicit in class scope and
> dereferencing the function pointer to call the referred function is also
> implicit
> anyway.
>
> Of course in total there should be two uses of 'this->' here:
> - one for the pointer itself since it is a member
> - one for the refered function since it must be applied on an object to
> be
> called
>
> I think it would be natural for both uses to be implicit here.
> Please, anyone wants to comment on this ?[/color]

What to comment? The ->* is required.

V

[Timothy Madden]

Re: Calling through pointers to member functions

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[Timothy Madden]

Re: Calling through pointers to member functions

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