Calling through pointers to member functions

T

Timothy Madden

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fortunately dare.
 
T

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::*LocateMbx)();
MbxAddress(bool fManagers = true)
{
if (fManagers)
LocateMbx = &MbxAddress::LocateAnyMbx;
else
LocateMbx = &MbxAddress::LocateUserMbx;
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
 
V

Victor Bazarov

Timothy Madden said:
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 ?

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.
Something like this:

class MbxAddress
{
protected:
void LocateAnyMbx()
{
}

void LocateUserMbx()
{
}

public:
void (MbxAddress::*LocateMbx)();
MbxAddress(bool fManagers = true)
{
if (fManagers)
LocateMbx = &MbxAddress::LocateAnyMbx;
else
LocateMbx = &MbxAddress::LocateUserMbx;
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 ?

What to comment? The ->* is required.

V
 
T

Timothy Madden

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