Function closeEnough

property_test.go:980–999

closeEnough reports whether two floats agree to within a relative tolerance suitable for decimal round-trip comparisons.

(a, b float64)

// closeEnough reports whether two floats agree to within a relative tolerance
// suitable for decimal round-trip comparisons.
func closeEnough(a, b float64) bool {
	if a == b {
		return true
	}
	const rel = 1e-15
	diff := a - b
	if diff < 0 {
		diff = -diff
	}
	if a < 0 {
		a = -a
	}
	if b < 0 {
		b = -b
	}
	if a < b {
		a, b = b, a
	}
	return diff/a < rel
}