Generic swap: Difference between revisions

{{incorrect|Delphi|Option 1 demonstrates a dubious arithmetic trick for swapping integers that works on two's complement hardware thanks to wrapping behavior of arithmetic overflow. Neither option demonstrates generic programming: swapping two variables using the same function or operator, regardless of their type.}}

Option 1:

procedure Swap(var a, b: Integer);

begin

a := a + b;

b := a - b;

a := a - b;

end;

</lang>

Option 2:

<lang Delphi>

procedure Swap(var a, b: Integer);

temp: Integer;