How to sort a 2D array by column

[Chris Cain via Digitalmars-d-learn]

On Saturday, 7 June 2014 at 19:14:01 UTC, Chris Cain wrote:
>> This is my attemot to create a compare object. But I don't 
>> know how to use it together with .sort member function
>
>
> Don't use the .sort property. Use std.algorithm.sort, which has 
> a "less" predicate (that should return a bool).
>
> http://dlang.org/phobos/std_algorithm.html#sort

Also note that the examples use a string to define the predicate, 
but it accepts functions as well. Such as:

     bool myCompareFunc(AType lhs, AType rhs)
     {
         return lhs.blah < rhs.blah;
     }

     //...
     AType[] arr;
     //...
     arr.sort!myCompareFunc();