D-Programming-Language/druntime — pull request #639 by denis-sh (2013-10-16 11:25:03+00:00)
Title: Add `GC.getWeakRefTarget` function.

A basic functionality for weak reference implementation. We want to be able to do things like this:
```D
if(!atomicLoad(weakPtr)) // fast check
return null;
return GC.getWeakRefTarget(weakPtr);
```