How can I use a function pointer to non-static member function of a class.

[Assertor]

Hi All,

Except function pointer to a static member funciton of a class (or a
function).

As the following code, I could pointer a non-static member function of
a class.
And "Equal" was printed, the pointer has meaning.

But how can I use it??
I.e., I'd like to call the member method by using the function pointer
(like using c function pointer).


class TMyClass
{
public:
int DoIt(float a, char b, char c){ ... };
}

int (TMyClass::*pt2Member)(float, char, char) = NULL;
pt2Member = &TMyClass:oIt;

// C++
if(pt2Member== &TMyClass:oIt)
cout << "Equal" << endl;

pt2Member(1.2f, 'a', 'b'); //<------ error.

As u know, in case that the function pointer piont a non-static member
function, the pointer can invoke the member function.

 

[Victor Bazarov]

[..]
As the following code, I could pointer a non-static member function of
a class.
And "Equal" was printed, the pointer has meaning.

But how can I use it??

You need an instance of the class in the form of an object, a reference,
or a pointer.

I.e., I'd like to call the member method by using the function pointer
(like using c function pointer).


class TMyClass
{
public:
int DoIt(float a, char b, char c){ ... };
}

;

int (TMyClass::*pt2Member)(float, char, char) = NULL;
pt2Member = &TMyClass:oIt;

I suppose this is inside a function of some kind.

// C++
if(pt2Member== &TMyClass:oIt)
cout << "Equal" << endl;

pt2Member(1.2f, 'a', 'b'); //<------ error.

You need an instance of 'TMyClass', and then use it:

TMyClass t;

(t.*pt2Member)(1.2f, 'a', 'b');

As u know, in case that the function pointer piont a non-static member
function, the pointer can invoke the member function.

Huh?

V