Temporarily add go-agentx (w/ fixes to lexico ordering)

go-agentx/marshaler/multi.go

@@ -0,0 +1,33 @@
+// Copyright 2018 The agentx authors
+// Licensed under the LGPLv3 with static-linking exception.
+// See LICENCE file for details.
+
+package marshaler
+
+import (
+	"encoding"
+)
+
+// Multi defines a binary marshaler that marshals all child marshalers
+// and concatinate the results.
+type Multi []encoding.BinaryMarshaler
+
+// NewMulti returns a new instance of MultiBinaryMarshaler.
+func NewMulti(marshalers ...encoding.BinaryMarshaler) Multi {
+	return Multi(marshalers)
+}
+
+// MarshalBinary marshals all the binary marshalers and concatinates the results.
+func (m Multi) MarshalBinary() ([]byte, error) {
+	result := []byte{}
+
+	for _, marshaler := range m {
+		data, err := marshaler.MarshalBinary()
+		if err != nil {
+			return nil, err
+		}
+		result = append(result, data...)
+	}
+
+	return result, nil
+}