Add DeepCopy! Also-- optimize conversion for []byte

pkg/conversion/deep_copy.go

@@ -0,0 +1,38 @@
+/*
+Copyright 2015 Google Inc. All rights reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package conversion
+
+import (
+	"reflect"
+)
+
+var deepCopier = NewConverter()
+
+// DeepCopy makes a deep copy of source. Won't work for any private fields!
+// For nil slices, will return 0-length slices. These are equivilent in
+// basically every way except for the way that reflect.DeepEqual checks.
+func DeepCopy(source interface{}) (interface{}, error) {
+	src := reflect.ValueOf(source)
+	v := reflect.New(src.Type()).Elem()
+	s := &scope{
+		converter: deepCopier,
+	}
+	if err := deepCopier.convert(src, v, s); err != nil {
+		return nil, err
+	}
+	return v.Interface(), nil
+}