On Fri, Oct 19, 2001 at 11:57:34AM +0100, Angus Leeming wrote:
> > [And you can use a lot of forward declarations instead of including whole
> > headers (especially true for enums)...]
>
> Tell me how! (PLEASE!) I've always been irritated by this. How do you deal
> with:
>
> struct foo {
> enum bar { ... };
> };
>
> class foo2 {
> func(foo::bar);
> };
>
> I've never worked out how to forward-declare foo::bar.
It's not possible.
The point is, you can hide it if you are willing to pay for an extra
indirection:
Your problem:
////////////////////////////////////////////////////////////////////
//--------- foo.h --------- //
struct foo {
enum bar { ... };
};
//--------- foo2.h --------- //
#include "foo.h" // needed here, and consequently used in every file
// that includes foo2.h, say baz.h
class foo2 {
func(foo::bar);
};
//--------- foo2.C --------- //
#include "foo2.h"
foo2::func(foo::bar) {}
////////////////////////////////////////////////////////////////////
Enum-hiding in action:
////////////////////////////////////////////////////////////////////
//--------- foo.h --------- //
struct foo {
enum bar { ... };
};
struct foo_bar_wrap {
foo::bar the_foo_bar;
};
//--------- foo2.h --------- //
//#include "foo.h" // not needed anymore!
struct foo_bar_wrap; // this is sufficient
class foo2 {
func(foo_bar_wrap const &); // pay on indirection
};
//--------- foo2.C --------- //
#include "foo.h"
#include "foo2.h"
foo2::func(foo_bar_wrap const & w)
{
// use w.the_foo_bar
}
////////////////////////////////////////////////////////////////////
> Incidentally, and general point: it's Friday. Why all the smileys?
Because I did not work on Wednesday it is the second working day of the
current week, which makes today a Tuesday...
Andre'
--
André Pönitz .............................................. [EMAIL PROTECTED]
