How to use a function without their sources

[nazriel]

On Friday, 18 January 2013 at 18:23:03 UTC, Johannes Pfau wrote:
> Am Fri, 18 Jan 2013 19:17:33 +0100
> schrieb "nazriel" <spam at dzfl.pl>:
>
>> [...]
>> 
>> Nice!
>> This should be mentioned at Language Reference, so it won't 
>> get lost.
>> 
>
> Isn't this documented? I thought it was well known that you can 
> mark D
> functions as extern(C). It's needed when implementing callback
> functions for C, for example.
>
I mean, some kind of pointer how to achieve such thing (Question 
in first post).

To be honest, I did think that there is some other way than using 
extern (C) way.

> You also get all the problems of unmangled C names, I remember 
> some
> nice segfaults in Derelict related to this (fixed some time ago 
> in
> derelict.)