@nogc formattedWrite

[Ilya Yaroshenko]

On Saturday, 7 October 2017 at 18:14:00 UTC, Nordlöw wrote:
> Is it currently possible to somehow do @nogc formatted output 
> to string?
>
> I'm currently using my `pure @nogc nothrow` array-container 
> `CopyableArray` as
>
> @safe pure /*TODO nothrow @nogc*/ unittest
> {
>     import std.format : formattedWrite;
>     const x = "42";
>     alias A = CopyableArray!(char);
>     A a;
>     a.formattedWrite!("x : %s")(x);
>     assert(a == "x : 42");
> }
>
> but I can't tag the unittest as `nothrow @nogc` because of the 
> call to `formattedWrite`. Is this because `formattedWrite` 
> internally uses the GC for buffer allocations or because it may 
> throw?
>
> It would be nice to be able to formatted output in -betterC...

Phobos code is not @nogc (can be fixed), but it will not nothrow.

PRs with  @nogc formatting functionality are welcome in Mir 
Algorithm.

Cheers,
Ilya