In article <B34531FC-19E86D@192.168.1.8>, Gabor Greif
<gabor@no.netopia.com> wrote:

> Is there a provision in the standard for pointer-to-member-functions that
> are "const"?
>
> I guess the syntax would be for example
>
> typedef void (T::*cptmf)(void) const;
>
> My compiler accepts this syntax, though it allows me to pass a ptmf where a
> cptmf is needed (with typedef void (T::*ptmf)(void); ) so I am not
> completely sure.
>
> I suspect this would be a breach of the promise to leave the "this" object
> constant:
>
> struct M
> {
>         void bar(void);
> };
>
> static void foo(void (M::*cb)() const)
> {
>         const M m;
>
>         foo(&M::bar);   // should be illegal: ptmf passed where cptmf needed
>                                 // but allowed by my compiler
>
>         (m.*cb)();      // should be okay
>         (m.*(&M::bar))();       // should be illegal: non-const
member-function
>                                         // invoked on const object
> }
>
>
> Is  my reasoning correct?

Yes.

Is there a provision in the standard for pointer-to-member-functions that
are "const"?

I guess the syntax would be for example

typedef void (T::*cptmf)(void) const;

My compiler accepts this syntax, though it allows me to pass a ptmf where a
cptmf is needed (with typedef void (T::*ptmf)(void); ) so I am not
completely sure.

I suspect this would be a breach of the promise to leave the "this" object
constant:

struct M
{
 void bar(void);
};

static void foo(void (M::*cb)() const)
{
 const M m;

 foo(&M::bar); // should be illegal: ptmf passed where cptmf needed
    // but allowed by my compiler

 (m.*cb)(); // should be okay
 (m.*(&M::bar))(); // should be illegal: non-const member-function
     // invoked on const object
}


Is  my reasoning correct?

Thanks,

 Gabor
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