sortOn: sorts range of aggregates by member name(s)

[via Digitalmars-d]

On Monday, 10 November 2014 at 19:58:32 UTC, Nordlöw wrote:
> On Monday, 10 November 2014 at 03:38:49 UTC, Andrei 
> Alexandrescu wrote:
>> That's a better approach, thanks. A few compelling examples 
>> would help.
>>
>>
>> Andrei
>
> One more thing. How should reverse sorting be handled in 
> elegant way? Like this
>
> https://github.com/nordlow/justd/blob/master/sort_ex.d#L57
>
> or via some other clever solution I haven't thought about?

By chaining it with std.range.retro? But this will of course be 
lazy, and will lose the information that the range is sorted.

Maybe there doesn't need to be a special facility for that, if 
it's allowed to specify arbitrary expressions?

     container.sortBy!(a =>  a.intMember)    // ascending
     container.sortBy!(a => -a.intMember)    // descending

Or shorter (the expression will be mixed in):

     container.sortBy!" intMember";          // ascending
     container.sortBy!"-intMember";          // descending