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.

Thanks for tips!

On Tuesday, 11 December 2012 at 15:52:31 UTC, Chopin wrote:
> 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.
>
> Thanks for tips!

This may or may not be the fastest way.

This should give you a good idea of what's going on:
http://dlang.org/d-array-article.html

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