🚀 go-pugleaf

In article <1992Nov2.030927.14309@njitgw.njit.edu> dic5340@hertz.njit.edu (David Charlap) writes:
>A am using Borland C++ 3.1 for Windows.  I managed to declare an
>object of type Bag to store assorted objects in.  Now, I want to call
>a certain member function (the paint method) on each object in the
>bag.

Well the manual is correct, though perhaps obscure about what is considered
an "iterFuncType".  What you need to do is declare a global function
taking a reference to an object (Object&) and a void pointer which may be
used to acces optionnal arguments.  If you want the "iterFuncType" to be a
private member of the class, you will need to declare it "static".

For example:

class Child: public TWindow
{
    ...
}

class MainWnd: public TWindow
{
    // fooBag is a collection of Child objects
    PBag fooBag;
    ...
    virtual void Paint(HDC, PAINTSTRUCT&);
    static void PaintKids(Object&, void*);
    ...
}

void MainWnd::Paint(HDC PaintDC, PAINTSTRUCT& PaintInfo)
{
    ...
    // Call each Child object's Paint method with PaintInfo as argument
    fooBag->forEach(PaintKids, &PaintInfo);
    ...
}

void MainWnd::PaintKids(Object& o, void* p)
{
    PAINTSTRUCT *ps = p;
 
    ((Child&) o).Paint(ps->hdc, *ps);
}


Hope this is useful.


Eric
-- 
Eric Trepanier
eric@tgm.CAM.ORG
"Everybody has a right to believe in something.
 I believe I'll have another beer."