## Expand description

*Function that is not part of the language but is offered as a helper for tests, etc.*
Conditional, constant-time swapping.
Returns `(x, y)`

if `c == 0`

and `(y, x)`

if `c == 1`

.

*Function that is not part of the language but is offered as a helper for tests, etc.*
Conditional, constant-time swapping.
Returns `(x, y)`

if `c == 0`

and `(y, x)`

if `c == 1`

.