groot/rbytes: extend StreamerInfo interface, introduce Binder and Cou…

…nter interfaces

groot/rbytes/rbytes.go

@@ -35,6 +35,9 @@ type StreamerInfo interface {
 
 	NewDecoder(kind StreamKind, r *RBuffer) (Decoder, error)
 	NewEncoder(kind StreamKind, w *WBuffer) (Encoder, error)
+
+	NewRStreamer(kind StreamKind) (RStreamer, error)
+	NewWStreamer(kind StreamKind) (WStreamer, error)
 }
 
 // StreamKind describes whether a composite ROOT value was encoded
@@ -122,6 +125,16 @@ type Streamer interface {
 	RStreamer
 }
 
+// Binder wraps the Bind method.
+type Binder interface {
+	Bind(ptr interface{}) error
+}
+
+// Counter wraps the Count method.
+type Counter interface {
+	Count(f func() int) error
+}
+
 const (
 	BypassStreamer                  uint32 = 1 << 12
 	CannotHandleMemberWiseStreaming uint32 = 1 << 17

groot/rbytes/rbytes_test.go

@@ -0,0 +1,34 @@
+// Copyright ©2020 The go-hep Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package rbytes
+
+import "testing"
+
+func TestStreamKind(t *testing.T) {
+	for _, tc := range []struct {
+		kind StreamKind
+		want string
+	}{
+		{
+			kind: ObjectWise,
+			want: "object-wise",
+		},
+		{
+			kind: MemberWise,
+			want: "member-wise",
+		},
+		{
+			kind: 255,
+			want: "0xff",
+		},
+	} {
+		t.Run(tc.want, func(t *testing.T) {
+			got := tc.kind.String()
+			if got != tc.want {
+				t.Fatalf("invalid kind: got=%q, want=%q", got, tc.want)
+			}
+		})
+	}
+}