Fastest way to append char to string?

[bearophile]

Chopin:

> Is this the fastest way to append a char to string?
>
> char c = 'a';
> string s;
> s ~= c;
>
> ?
>
> I have a program that does this many many times... and it's 
> slow. So I was wondering it it could be it.

Try the appender from std.array. It's supposed to be faster, but 
sometimes it's not faster. There was a patch to make it actually 
faster, but I don't know if it was already merged.

But if your program is "slow", then first of all profile it with 
-profile. Then define what you mean by "slow".

Bye,
bearophile