I'm making anagrams. According to the nextPermutation() docs, I need to 'sort by less' to get all permutations. ... Except the doc page doesn't mention how to do that, nor does std.algorithm.sort show how to sort a string. ... and the google results on the dlang forums from 2017 don't work.

I've tried .byCodeUnit. , .representation. I've tried sorting on the dchar. I've tried sorting the on string.

The closest I've gotten:

	string word = "bar";
	string line2 = toLower!(string)(word);
   	dchar[] line3 = sort(line2.to!(dchar[]));

"Error: cannot implicitly convert expression sort(to(line2)) of type SortedRange!(dchar[], "a < b") to dchar[]"

01.05.2020 10:38, Chris Katko пишет:
> I'm making anagrams. According to the nextPermutation() docs, I need to 'sort by less' to get all permutations. ... Except the doc page doesn't mention how to do that, nor does std.algorithm.sort show how to sort a string. ... and the google results on the dlang forums from 2017 don't work.
> 
> I've tried .byCodeUnit. , .representation. I've tried sorting on the dchar. I've tried sorting the on string.
> 
> The closest I've gotten:
> 
>      string word = "bar";
>      string line2 = toLower!(string)(word);
>         dchar[] line3 = sort(line2.to!(dchar[]));
> 
> "Error: cannot implicitly convert expression sort(to(line2)) of type SortedRange!(dchar[], "a < b") to dchar[]"
> 

import std;
void main()
{
    string word = "bar";
    dchar[] line3 = word.dup // make a copy to get a range of mutable elements
        .map!"dchar(a)" // convert char to dchar
        .array // convert range to random access range (dynamic array here) to enable sorting
        .sort  // sort
        .array; // convert SortedRange to dynamic array
    assert(line3 == "abr");
}

On Friday, 1 May 2020 at 07:38:53 UTC, Chris Katko wrote:
> I'm making anagrams. According to the nextPermutation() docs, I need to 'sort by less' to get all permutations. ... Except the doc page doesn't mention how to do that, nor does std.algorithm.sort show how to sort a string. ... and the google results on the dlang forums from 2017 don't work.
>
> I've tried .byCodeUnit. , .representation. I've tried sorting on the dchar. I've tried sorting the on string.
>
> The closest I've gotten:
>
> 	string word = "bar";
> 	string line2 = toLower!(string)(word);
>    	dchar[] line3 = sort(line2.to!(dchar[]));
>
> "Error: cannot implicitly convert expression sort(to(line2)) of type SortedRange!(dchar[], "a < b") to dchar[]"

You need to convert the sort output to dchar[], e.g.
---
dchar[] line3 = sort(line2.to!(dchar[])).to!(dchar[]);
---

Cheers,
Norm

On Friday, 1 May 2020 at 08:17:33 UTC, norm wrote:
> On Friday, 1 May 2020 at 07:38:53 UTC, Chris Katko wrote:
>> [...]
>
> You need to convert the sort output to dchar[], e.g.
> ---
> dchar[] line3 = sort(line2.to!(dchar[])).to!(dchar[]);
> ---
>
> Cheers,
> Norm

That works, thanks!

On 5/1/20 4:12 AM, drug wrote:
> 01.05.2020 10:38, Chris Katko пишет:
>> I'm making anagrams. According to the nextPermutation() docs, I need to 'sort by less' to get all permutations. ... Except the doc page doesn't mention how to do that, nor does std.algorithm.sort show how to sort a string. ... and the google results on the dlang forums from 2017 don't work.
>>
>> I've tried .byCodeUnit. , .representation. I've tried sorting on the dchar. I've tried sorting the on string.
>>
>> The closest I've gotten:
>>
>>      string word = "bar";
>>      string line2 = toLower!(string)(word);
>>         dchar[] line3 = sort(line2.to!(dchar[]));

dchar[] line3 = sort(line2.to!dchar[]).release;

https://dlang.org/phobos/std_range.html#.SortedRange.release


>>
>> "Error: cannot implicitly convert expression sort(to(line2)) of type SortedRange!(dchar[], "a < b") to dchar[]"
>>
> 
> import std;
> void main()
> {
>      string word = "bar";
>      dchar[] line3 = word.dup // make a copy to get a range of mutable elements
>          .map!"dchar(a)" // convert char to dchar

Don't do this, use to!(dchar[]) as you have above. This will create incorrect dchars for non-ascii text.

-Steve

01.05.2020 15:29, Steven Schveighoffer пишет:
> 
> Don't do this, use to!(dchar[]) as you have above. This will create incorrect dchars for non-ascii text.
> 
> -Steve


Argh, as always you're right. Funny that I never did that and sadly that I posted wrong code. Thank you, Steven, for correction of my wrong posts, I appreciate it.

On Friday, 1 May 2020 at 12:29:26 UTC, Steven Schveighoffer wrote:

>>>         dchar[] line3 = sort(line2.to!(dchar[]));
>
> dchar[] line3 = sort(line2.to!dchar[]).release;
>
> https://dlang.org/phobos/std_range.html#.SortedRange.release
>

hmmm, whích results in:
 Error: cannot use [] operator on expression of type dchar

On Friday, 1 May 2020 at 15:04:01 UTC, notna wrote:
> On Friday, 1 May 2020 at 12:29:26 UTC, Steven Schveighoffer wrote:
>
>>>>         dchar[] line3 = sort(line2.to!(dchar[]));
>>
>> dchar[] line3 = sort(line2.to!dchar[]).release;
>>
>> https://dlang.org/phobos/std_range.html#.SortedRange.release
>>
>
> hmmm, whích results in:
>  Error: cannot use [] operator on expression of type dchar

Working program:

import std.algorithm, std.conv, std.string, std.stdio;

void main() {
  string word = "bar";
  string line2 = toLower!(string)(word);
  dchar[] line3 = sort(line2.to!(dchar[])).release;
  writeln(line3);
}

You need to add parens.

01.05.2020 18:04, notna пишет:
> 
> hmmm, whích results in:
>   Error: cannot use [] operator on expression of type dchar
> 

try this:
```D
import std;
void main()
{
    string word = "Привет";
    dchar[] line3 = to!(dchar[])(word.dup) // make a copy to get a range of mutable char
                                           // and convert char to dchar
        .sort                              // sort it
        .release;                          // get the sorted range
    assert(line3 == "Пвеирт");
}
```

On Friday, 1 May 2020 at 15:15:29 UTC, bachmeier wrote:
> On Friday, 1 May 2020 at 15:04:01 UTC, notna wrote:
>> On Friday, 1 May 2020 at 12:29:26 UTC, Steven Schveighoffer wrote:
>>
>>>>>         dchar[] line3 = sort(line2.to!(dchar[]));
>>>
>>> dchar[] line3 = sort(line2.to!dchar[]).release;
>>>
>>> https://dlang.org/phobos/std_range.html#.SortedRange.release
>>>
>>
>> hmmm, whích results in:
>>  Error: cannot use [] operator on expression of type dchar
>
> Working program:
>
> import std.algorithm, std.conv, std.string, std.stdio;
>
> void main() {
>   string word = "bar";
>   string line2 = toLower!(string)(word);
>   dchar[] line3 = sort(line2.to!(dchar[])).release;
>   writeln(line3);
> }
>
> You need to add parens.

well, this makes very much sense ;)
THANKS a lot, works and helped to adopt some old code