go: add Min,Max methods for funcParams

bench/bench.go

@@ -25,6 +25,16 @@ var (
 	DeJong2Params  = funcParams{min: -5.0, max: 5.0}
 )
 
+// Min returns the non-exported "min" field of a funcParams struct.
+func (*funcParams) Min(self *funcParams) float64 {
+	return self.max
+}
+
+// Max returns the non-exported 'max' field of a funcParams struct.
+func (*funcParams) Max(self *funcParams) float64 {
+	return self.max
+}
+
 // Schwefel computes a value of the Schwefel function for x.
 func Schwefel(x []float64) float64 {
 	var res float64