On Monday, 14 July 2014 at 22:39:08 UTC, Nordlöw wrote:
> might be were to start.

Is it really this simple?

bool isValidCodePoint(dchar c)
{
    return c < 0xD800 || (c >= 0xE000 && c < 0x110000);
}

On Monday, 14 July 2014 at 22:39:15 UTC, bearophile wrote:
> Several combinations of unicode chars are not meaningful/valid (like pairs of ligatures). Any thing that has to work correctly with Unicode is complex.

So I guess we need something more than just isValidCodePoint right?

On Monday, 14 July 2014 at 22:32:25 UTC, bearophile wrote:
> Brad Anderson:
>
>> Alternative:
>>
>> randomSample(lowercase, 10, lowercase.length).writeln;
>
> From randomSample docs:
>
>>Selects a random subsample out of r, containing exactly n elements. The order of elements is the same as in the original range.<
>
> Bye,
> bearophile

Hmm, good catch. Not the behavior I expected.

On Monday, 14 July 2014 at 22:45:29 UTC, Nordlöw wrote:
> So I guess we need something more than just isValidCodePoint right?

Here's a first try:

https://github.com/nordlow/justd/blob/master/random_ex.d#L53

Nordlöw:

> https://github.com/nordlow/justd/blob/master/random_ex.d#L53

Isn't @trusted mostly for small parts of Phobos code? I suggest to avoid using @trusted in most cases.

Bye,
bearophile

On Tuesday, 15 July 2014 at 00:03:04 UTC, bearophile wrote:
> to avoid using @trusted in most cases.

Could someone elaborate shortly which cases this means?

Nordlöw:

> Could someone elaborate shortly which cases this means?

All cases where you really can't live without it :-) It's like a cast(.

Bye,
bearophile

On Tuesday, 15 July 2014 at 18:50:06 UTC, bearophile wrote:
> All cases where you really can't live without it :-) It's like

Hmm. I guess I'm gonna have to remove some @trusted tagging then ;)

On 15/07/14 00:16, "Nordlöw" via Digitalmars-d-learn wrote:
> Is there a natural way of generating/filling a string/wstring/dstring of a
> specific length with random contents?

I think you need to be more specific about what kind of random contents you are interested in having.

Are you interested in having each character in the sequence randomly chosen independently of all the others, or do you want a random subset of all available characters (i.e. no character appears more than once), or something else again?

> Alternative:
>
> randomSample(lowercase, 10, lowercase.length).writeln;

No, I don't think that's appropriate, because it will pick 10 individual characters from a, b, c, ... , z (i.e. no character will appear more than once), and the characters picked will appear in alphabetical order.

Incidentally, if lowercase has the .length property, there's no need to pass the length separately to randomSample.  Just passing lowercase itself and the number of sample points desired is sufficient.