Function EquateApprox

cmp/cmpopts/equate.go:50–59

EquateApprox returns a [cmp.Comparer] option that determines float32 or float64 values to be equal if they are within a relative fraction or absolute margin. This option is not used when either x or y is NaN or infinite. The fraction determines that the difference of two values must be within the s

(fraction, margin float64)

//
// EquateApprox can be used in conjunction with [EquateNaNs].
func EquateApprox(fraction, margin float64) cmp.Option {
	if margin < 0 || fraction < 0 || math.IsNaN(margin) || math.IsNaN(fraction) {
		panic("margin or fraction must be a non-negative number")
	}
	a := approximator{fraction, margin}
	return cmp.Options{
		cmp.FilterValues(areRealF64s, cmp.Comparer(a.compareF64)),
		cmp.FilterValues(areRealF32s, cmp.Comparer(a.compareF32)),
	}
}

type approximator struct{ frac, marg float64 }