isSingleButton function

Returns whether buttons contains one and only one button.

The buttons parameter is a bit field where each set bit represents a button. This function returns whether there is only one set bit in the given integer.

It returns false when buttons is zero.

Example:

  assert(isSingleButton(0x1));
  assert(!isSingleButton(0x11));
  assert(!isSingleButton(0));

See also:

• smallestButton, which returns the button in a buttons bit field with the smallest integer button.