How do I make an extern function?
BCS
none at anon.com
Tue Jun 29 07:03:39 PDT 2010
Hello Simen,
> BCS <none at anon.com> wrote:
>
>> You can resolve this by having a a.di file with the extern foo(); in
>> it (DMD has a flag to generate such a file for you). OTOH without
>> knowing what you are doing, I can't tell if this is the correct
>> solution.
>>
> I'm trying to create a framework in which the user may provide his own
> foo( ), so the name of module b is impossible to know.
>
Several approaches: In addition to interfaces as Steven pointed out, if you
don't need overloading you can use a function pointer. Also for either option,
you could have a global variable that the users code sets from a static this:
module a;
void function(int) foo;
// use foo
------
moduel b;
import a;
void theFoo(int i) { ... }
static this() { foo = &theFoo; }
If you want more encapsulation, you could switch to a registration function
rather than having people muck around in the dirt. Also, if you have some
appropriate object, you can put it there and avoid a global and all it entails.
--
... <IXOYE><
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