"Saaa" <empty@needmail.com> wrote in message news:fnsmjb$1vsq$1@digitalmars.com...
> If I'd know the lenght I would just do :)
>
> c[0 .. 4] = `1234`;
> writefln( c[0 .. 4]);
>
> I'm looking into making use of:
> struct charS{
>    char c;
>    int leng;
> }

So, in other words, you're re-implementing dynamic arrays?

What I'm wondering is why you need this?  What is it that you're trying to do?

Except that it will be on the stack :)

I'll be testing the speed difference.

>
> So, in other words, you're re-implementing dynamic arrays?
>
> What I'm wondering is why you need this?  What is it that you're trying to do?
> 

"Saaa" <empty@needmail.com> wrote in message news:fntlub$1iq8$1@digitalmars.com...
> Except that it will be on the stack :)
>
> I'll be testing the speed difference.

So you want a string buffer on the stack, or what?  If it's on the stack and you're doing a lot of operations that would otherwise involve concatenations, it'll be faster.  If it's in a function that's called a lot, it'll be faster, since no heap allocation will occur.  But, then you're limited by the size of the array, and you can't use the same things -- no concatenations, namely.

It's a tradeoff of syntactic niceness and flexibility of size vs. speed.

Saaa:
> I'll be testing the speed difference.

You can allocate memory on the stack with alloca() too.
It may sound strange, but iterating on a dynamic array is often a bit faster.

Bye,
bearophile

Yes, that does sound strange.
Do you know why this is the case?

>
> You can allocate memory on the stack with alloca() too.
> It may sound strange, but iterating on a dynamic array is often a bit
> faster.
>
> Bye,
> bearophile

Saaa:
> Yes, that does sound strange.
> Do you know why this is the case?

I don't know why, but you can write a little benchmark in 5 minutes to see if it's true on your PC too :-)

Bye,
bearophile

I'll do that, but my computer isn't that prototypical that I can use the outcome as a standard for all my customers :D

>> Yes, that does sound strange.
>> Do you know why this is the case?
>
> I don't know why, but you can write a little benchmark in 5 minutes to see if it's true on your PC too :-)
>
> Bye,
> bearophile