Method setAsNaN

context.go:107–129

setAsNaN sets d to the first NaNSignaling, or otherwise first NaN, of x and y. x is required, y is optional. Expects one of the two inputs to be NaN.

(d *Decimal, x, y *Decimal)

// x and y. x is required, y is optional. Expects one of the two inputs
// to be NaN.
func (c *Context) setAsNaN(d *Decimal, x, y *Decimal) (Condition, error) {
	var nan *Decimal
	// Per the method contract, NaNSignaling takes precedence over NaN.
	if x.Form == NaNSignaling {
		nan = x
	} else if y != nil && y.Form == NaNSignaling {
		nan = y
	} else if x.Form == NaN {
		nan = x
	} else if y != nil && y.Form == NaN {
		nan = y
	} else {
		return 0, errors.New("no NaN value found; was shouldSetAsNaN called?")
	}
	d.Set(nan)
	var res Condition
	if nan.Form == NaNSignaling {
		res = InvalidOperation
		d.Form = NaN
	}
	_, err := c.goError(res)
	return res, err
}

func (c *Context) add(d, x, y *Decimal, subtract bool) (Condition, error) {
	if c.shouldSetAsNaN(x, y) {