Allocating a wstring on the stack (no GC)?

[Brad Anderson via Digitalmars-d]

On Wednesday, 7 May 2014 at 18:26:08 UTC, Maxime 
Chevalier-Boisvert wrote:
> I have a very specific use case (JIT compiler) in which I have 
> a pre-allocated array of wchar string data stored somewhere in 
> memory. I'd like to be able to create a temporary D wstring 
> object to pass this as a "regular" string to other functions. 
> For performance reasons, it would be preferable not to 
> dynamically allocate or copy any data. Dynamically allocating 
> the strings tends to trigger the D GC which severely impacts 
> the performance.
>
> So, my question is, would it be possible for me to allocate a 
> wstring object on the stack, and manually set its string data 
> pointer and length? If so, how? Your wizardly help is much 
> appreciated.

Unless I'm misunderstanding it should be as simple as:

wchar[100] stackws; // alloca() if you need it to be dynamically 
sized.

A slice of this static array behaves just like a slice of a 
dynamic array.