Calling dynamically bound functions from weakly pure function

[Rene Zwanenburg via Digitalmars-d-learn]

On Friday, 18 July 2014 at 15:57:40 UTC, John Colvin wrote:
> On Friday, 18 July 2014 at 14:15:46 UTC, Rene Zwanenburg wrote:
>> For all intents and purposes, the following code can be weakly 
>> pure:
>>
>> struct VAO
>> {
>>
>> }
>
> urrmm. Did you mean to post more than that?

Haha yup. Not sure what happened there.

I'm a bit short on time at the moment, but what it comes down to 
is that Derelict loads functions from DLL's and assigns them to 
global function pointers. Of course, these function pointers have 
to be mutable.

Is there a nice way to call such functions from a pure function?