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import algorithm
import future
 
# p converst T to S and compares it as S
proc gen[S, T](list: seq[T], p: proc(a:T): S): seq[T] =
  list.sorted( (a, b) => system.cmp[S](a.p, b.p))
 
let list = @[1,2,3,4,5,6]
let p = proc(i:int): bool = i mod 2 == 0
 
echo gen(list, p)
 

prog.nim(11, 9) Info: template/generic instantiation from here
prog.nim(6, 16) Warning: '(a; b): auto' has no type. Typeless parameters are deprecated; only allowed for 'template' [TypelessParam]
prog.nim(11, 9) Info: template/generic instantiation from here
prog.nim(6, 17) Warning: '(a; b): auto' has no type. Typeless parameters are deprecated; only allowed for 'template' [TypelessParam]
prog.nim(11, 9) Info: template/generic instantiation from here
prog.nim(6, 39) Info: template/generic instantiation from here
lib/nim/system.nim(933, 8) Error: ambiguous call; both system.==(x: bool, y: bool) and system.==(x: bool, y: bool) match for: (bool, bool)

Standard output is empty