Get and return String by const-ref if used as rvalue

third_party/WebKit/Source/bindings/tests/results/modules/BooleanOrString.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This file has been auto-generated by code_generator_v8.py.
 // DO NOT MODIFY!
 
 // This file has been generated from the Jinja2 template in
 // third_party/WebKit/Source/bindings/templates/union_container.h.tmpl
 
@@ skipping 15 matching lines @@
  public:
   BooleanOrString();
   bool isNull() const { return m_type == SpecificTypeNone; }
 
   bool isBoolean() const { return m_type == SpecificTypeBoolean; }
   bool getAsBoolean() const;
   void setBoolean(bool);
   static BooleanOrString fromBoolean(bool);
 
   bool isString() const { return m_type == SpecificTypeString; }
-  String getAsString() const;
-  void setString(String);
-  static BooleanOrString fromString(String);
+  const String& getAsString() const;
+  void setString(const String&);
+  static BooleanOrString fromString(const String&);
 
   BooleanOrString(const BooleanOrString&);
   ~BooleanOrString();
   BooleanOrString& operator=(const BooleanOrString&);
   DECLARE_TRACE();
 
  private:
   enum SpecificTypes {
     SpecificTypeNone,
     SpecificTypeBoolean,
@@ skipping 36 matching lines @@
 
 }  // namespace blink
 
 // We need to set canInitializeWithMemset=true because HeapVector supports
 // items that can initialize with memset or have a vtable. It is safe to
 // set canInitializeWithMemset=true for a union type object in practice.
 // See https://codereview.chromium.org/1118993002/#msg5 for more details.
 WTF_ALLOW_MOVE_AND_INIT_WITH_MEM_FUNCTIONS(blink::BooleanOrString);
 
 #endif  // BooleanOrString_h