template/member function puzzle

[Glen Able]

Not sure if this a dumb syntax error, or if there some more subtle reason
why this doesn't work:

template <class ObjT> class Foo
{
typedef bool (ObjT::*TestFunction)();

public:
void Bar( ObjT* pObj,
TestFunction fn)
{
if (pObj->*fn()) // ERROR HERE : "term does not evaluate to a
function"
{

}
}
};

Any thoughts?

ta,
G.A.

 

[Sumit Rajan]

Not sure if this a dumb syntax error, or if there some more subtle reason
why this doesn't work:

template <class ObjT> class Foo
{
typedef bool (ObjT::*TestFunction)();

public:
void Bar( ObjT* pObj,
TestFunction fn)
{
if (pObj->*fn()) // ERROR HERE : "term does not evaluate to a
function"

This should "work":
if (pObj->fn())

or:
if ((*pObj->fn)())

Regards,
Sumit.

 

[Glen Able]

This should "work":
if (pObj->fn())

or:
if ((*pObj->fn)())

No, those just give new errors: 'fn is not a member of class [whatever]' .

 

[Glen Able]

to

ahhhh...stupid precedence error, innit.

I should've done:

if ((pObj->*fn)())
{

}

cheers
G.A.

 

[Sumit Rajan]

ahhhh...stupid precedence error, innit.

I should've done:

if ((pObj->*fn)())
{

}

Nice work!
I made a complete mess of it!!

Regards,
Sumit.