Defining tuple methods -

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This is a swap function for two-element tuple: 

  FN Swap & lt; A, B & gt; (OBJ: (A, B)) - & gt; (B, A) {Let (A, B) = Ob; (B, a)}   
 example usage:  
  main () {obj = (10i, 20i); Println! ("{}", Swap (obj)); }   
 Is there a way to define  swap  as a method on two-element toplevel? To wit. So that it can be called in such a way:  
  (10i, 20i) .swap ()    
 
 
 Yes, there is simply defining a new property and applying it immediately, something like this:  
  attribute swap & lt; U & gt; {FN Swap (Self) - & gt; U; } Impl & lt; A, B & gt; Swap & lt; (B, A)> For (A, B) {# [inline] FN swap (self) - & gt; (B, A) {Give (A, B) = Self; (B, A)}} FN main () {T = (1 U, 2 U); Println! ("{}", T.swap ()); }   
 Note that in order to use this method, you need to import the  swap  property in each module where you want to call the method.

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