On Thursday, 11 September 2014 at 15:07:03 UTC, Daniel Kozak wrote:
>
> or use alias minimum = reduce!"a < b";
> ;)

ok this one does not work

On Thursday, 11 September 2014 at 14:56:00 UTC, Daniel Kozak via Digitalmars-d-learn wrote:
> V Thu, 11 Sep 2014 14:49:02 +0000
> bearophile via Digitalmars-d-learn <digitalmars-d-learn@puremagic.com>
> napsáno:
>
>> Daniel Kozak:
>> 
>> You can just use min:
>> 
>> import std.stdio, std.algorithm;
>> 
>> struct Thing {
>>      uint x;
>>      alias x this;
>> }
>> 
>> alias minimum = reduce!min;
>> 
>> void main() {
>> 	immutable ar1 = [10, 20, 30, 40, 50];
>> 	ar1.minimum.writeln;
>> 
>> 	immutable ar2 = [Thing(10), Thing(20), Thing(40)];
>> 	ar2.minimum.writeln;
>> }
>> 
>> Bye,
>> bearophile
>
> Yep, this look the most idiomatic :).
>
> Why there is no phobos function for minimum of array(range)?

There is: http://dlang.org/phobos/std_algorithm.html#.minPos

To note though: minPos will "find" the position of the smallest element, whereas reduce will accumulate and return the lowest value. That said:

alias minmax = reduce!(min, max);

auto mm = ar1.minmax();
auto min = mm[0];
auto max = mm[1];

Found both in one line of code, and only 1 iteration of ar1.

On Thursday, 11 September 2014 at 15:29:18 UTC, Daniel Kozak
wrote:
> On Thursday, 11 September 2014 at 15:07:03 UTC, Daniel Kozak wrote:
>>
>> or use alias minimum = reduce!"a < b";
>> ;)
>
> ok this one does not work

Yeah, it's actually reduce!"a < b ? a : b"

On Thursday, 11 September 2014 at 14:49:03 UTC, bearophile wrote:
> void main() {
>       //... 	
>
> 	immutable ar2 = [Thing(10), Thing(20), Thing(40)];
> 	ar2.minimum.writeln;
> }
>
> Bye,
> bearophile

Even better:

void main
{
    immutable(Thing)[] ar2 = [10, 20, 40];
    ar2.minimum.writeln;
}

On Thursday, 11 September 2014 at 14:49:03 UTC, bearophile wrote:
> Daniel Kozak:
>
> You can just use min:
>
> import std.stdio, std.algorithm;
>
> struct Thing {
>     uint x;
>     alias x this;
> }
>
> alias minimum = reduce!min;
>
> void main() {
> 	immutable ar1 = [10, 20, 30, 40, 50];
> 	ar1.minimum.writeln;
>
> 	immutable ar2 = [Thing(10), Thing(20), Thing(40)];
> 	ar2.minimum.writeln;
> }
>
> Bye,
> bearophile

Using the "alias x this" solution would work, but my actual struct is not a simple struct, so the comparison isn't exactly (a.x < b.x).

On Thursday, 11 September 2014 at 21:28:59 UTC, Colin wrote:
> Using the "alias x this" solution would work, but my actual struct is not a simple struct, so the comparison isn't exactly (a.x < b.x).

You could always override opCmp as well:

http://dlang.org/operatoroverloading.html#compare