• Andrey (13/19) Dec 18 2018 Need to reverse and sort array elements to get this result:
• Simen =?UTF-8?B?S2rDpnLDpXM=?= (16/35) Dec 18 2018 There are in fact to instances of the same problem here:
• angel (15/34) Dec 18 2018 Did you try this ?
• Andrey (4/5) Dec 18 2018 Thank you everybody.
• Andrea Fontana (3/8) Dec 18 2018 You call "array" the enum just like the array() function.

Andrey <saasecondbox yandex.ru> writes:

Hi,
Have array:
 enum array = ["qwerty", "a", "baz"];

Need to reverse and sort array elements to get this result:
 [a, ytrewq, zab]

Did this:
 enum result = array.map!(value => value.retro()).sort();

Got:
 Error: template std.algorithm.sorting.sort cannot deduce 
 function from argument types !()(MapResult!(__lambda1, 
 string[])), candidates are:

/usr/include/dmd/phobos/std/algorithm/sorting.d(1849,1):        
std.algorithm.sorting.sort(alias less = "a < b", SwapStrategy ss 
= SwapStrategy.unstable, Range)(Range r) if ((ss == 
SwapStrategy.unstable && (hasSwappableElements!Range || 
hasAssignableElements!Range) || ss != SwapStrategy.unstable && 
hasAssignableElements!Range) && isRandomAccessRange!Range && 
hasSlicing!Range && hasLength!Range)

How to solve the problem?

Simen =?UTF-8?B?S2rDpnLDpXM=?= <simen.kjaras gmail.com> writes:

On Tuesday, 18 December 2018 at 12:07:37 UTC, Andrey wrote:
 Hi,
 Have array:
 enum array = ["qwerty", "a", "baz"];

 Need to reverse and sort array elements to get this result:
 [a, ytrewq, zab]

 Did this:
 enum result = array.map!(value => value.retro()).sort();

 Got:
 Error: template std.algorithm.sorting.sort cannot deduce 
 function from argument types !()(MapResult!(__lambda1, 
 string[])), candidates are:

 /usr/include/dmd/phobos/std/algorithm/sorting.d(1849,1):        
 std.algorithm.sorting.sort(alias less = "a < b", SwapStrategy 
 ss = SwapStrategy.unstable, Range)(Range r) if ((ss == 
 SwapStrategy.unstable && (hasSwappableElements!Range || 
 hasAssignableElements!Range) || ss != SwapStrategy.unstable && 
 hasAssignableElements!Range) && isRandomAccessRange!Range && 
 hasSlicing!Range && hasLength!Range)

 How to solve the problem?

There are in fact to instances of the same problem here:
The problem is map and retro are lazy - they return an element at 
a time, and so can't be sorted. You will need to make a arrays 
from them:

     import std.array : array;
     import std.range : retro;
     import std.algorithm : map, sort;

     enum arr = ["qwerty", "a", "baz"];
     enum result = arr
                     .map!(value => value.retro().array)
                     .array // This creates an array from map's 
result.
                     .sort();

--
   Simen

angel <andrey.gelman gmail.com> writes:

On Tuesday, 18 December 2018 at 12:07:37 UTC, Andrey wrote:
 Hi,
 Have array:
 enum array = ["qwerty", "a", "baz"];

 Need to reverse and sort array elements to get this result:
 [a, ytrewq, zab]

 Did this:
 enum result = array.map!(value => value.retro()).sort();

 Got:
 Error: template std.algorithm.sorting.sort cannot deduce 
 function from argument types !()(MapResult!(__lambda1, 
 string[])), candidates are:

 /usr/include/dmd/phobos/std/algorithm/sorting.d(1849,1):        
 std.algorithm.sorting.sort(alias less = "a < b", SwapStrategy 
 ss = SwapStrategy.unstable, Range)(Range r) if ((ss == 
 SwapStrategy.unstable && (hasSwappableElements!Range || 
 hasAssignableElements!Range) || ss != SwapStrategy.unstable && 
 hasAssignableElements!Range) && isRandomAccessRange!Range && 
 hasSlicing!Range && hasLength!Range)

 How to solve the problem?

Did you try this ?

   import std.stdio;
   import std.algorithm;
   import std.range;
   import std.conv;

   void main()
   {
   	enum input = ["qwerty", "a", "baz"];
   	enum output = input.map!(value => 
value.retro().to!string()).array.sort();
	
   	writeln(input);
   	writeln(output);
   }

Andrey <saasecondbox yandex.ru> writes:

On Tuesday, 18 December 2018 at 12:32:35 UTC, angel wrote:
 On Tuesday, 18 December 2018 at 12:07:37 UTC, Andrey wrote:

Thank you everybody.
Here was another problem that local variable 'array' shadows 
function 'array()' from std.array.

Andrea Fontana <nospam example.org> writes:

On Tuesday, 18 December 2018 at 12:47:59 UTC, Andrey wrote:
 On Tuesday, 18 December 2018 at 12:32:35 UTC, angel wrote:
 On Tuesday, 18 December 2018 at 12:07:37 UTC, Andrey wrote:

 Thank you everybody.
 Here was another problem that local variable 'array' shadows 
 function 'array()' from std.array.

You call "array" the enum just like the array() function.
Change enum array into enum arr and array.map!... into arr.map!...