update

mathx/math.go

@@ -0,0 +1,46 @@
+package mathx
+
+import (
+	"github.com/charlienet/go-mixed/expr"
+	"golang.org/x/exp/constraints"
+)
+
+type Real interface {
+	constraints.Integer | constraints.Float
+}
+
+// Max returns the larger one of v1 and v2.
+func Max[T Real](v1, v2 T) T {
+	return expr.Ternary(v1 > v2, v1, v2)
+}
+
+// Min returns the smaller one of v1 and v2.
+func Min[T Real](v1, v2 T) T {
+	return expr.Ternary(v1 < v2, v1, v2)
+}
+
+func Abs[T Real](val T) T {
+	return expr.Ternary(val < 0, -val, val)
+}
+
+// Neg returns the negative of value. It does not negate value. For
+// negating, simply use -value instead.
+func Neg[T Real](value T) T {
+	return expr.Ternary(value < 0, value, -value)
+}
+
+func Clamp[T Real](value, min, max T) T {
+	if min > max {
+		return min
+	}
+
+	if value < min {
+		return min
+	}
+
+	if value > max {
+		return max
+	}
+
+	return value
+}