Appender and CTFE

[Andrei Alexandrescu]

On 3/3/11 8:34 AM, Steven Schveighoffer wrote:
> On Thu, 03 Mar 2011 07:41:49 -0500, Trass3r <un at known.com> wrote:
>
>> replace() doesn't work in CTFE anymore cause it was modified to be
>> based on Appender.
>> According to klickverbot, other phobos functions share that fate.
>>
>> I think something should be done about this. Couldn't Appender be
>> implemented without using a pointer to a struct?
>
> Yes, it is something I intend to do. I want to make an (un at safe) scoped
> appender which does not use a pImpl, along with a safe appender which
> does use pImpl.
>
> It should be as easy as making the impl struct a public struct.
>
> -Steve

One broader question would be if Appender's optimization is still needed 
after Steve's improvements to ~=. What is the current performance gap 
between using ~= and Appender?

Andrei