Gin: Make it easier to implement Wrappable

gin/wrappable_unittest.cc

 // Copyright 2013 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.
 
 #include "base/logging.h"
 #include "gin/arguments.h"
 #include "gin/handle.h"
 #include "gin/object_template_builder.h"
 #include "gin/per_isolate_data.h"
 #include "gin/public/isolate_holder.h"
 #include "gin/test/v8_test.h"
 #include "gin/try_catch.h"
 #include "gin/wrappable.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace gin {
 namespace {
 
-class MyObject : public Wrappable {
+class MyObject : public Wrappable<MyObject> {
  public:
   static gin::Handle<MyObject> Create(v8::Isolate* isolate);
 
   int value() const { return value_; }
   void set_value(int value) { value_ = value; }
 
-  static WrapperInfo kWrapperInfo;
-  virtual WrapperInfo* GetWrapperInfo() OVERRIDE;
-
  private:
   MyObject() : value_(0) {}
   virtual ~MyObject() {}
 
   int value_;
 };
 
-WrapperInfo MyObject::kWrapperInfo = { kEmbedderNativeGin };
-
 gin::Handle<MyObject> MyObject::Create(v8::Isolate* isolate) {
   return CreateHandle(isolate, new MyObject());
 }
 
-WrapperInfo* MyObject::GetWrapperInfo() {
-  return &kWrapperInfo;
-}
-
-
-class MyObject2 : public Wrappable {
- public:
-  MyObject2() {
-  }
-  static WrapperInfo kWrapperInfo;
-  virtual WrapperInfo* GetWrapperInfo() OVERRIDE;
+class MyObject2 : public Wrappable<MyObject2> {
 };
 
-WrapperInfo MyObject2::kWrapperInfo = { kEmbedderNativeGin };
-
-WrapperInfo* MyObject2::GetWrapperInfo() {
-  return &kWrapperInfo;
-}
-
-
-class MyObjectBlink : public Wrappable {
- public:
-  MyObjectBlink() {
-  }
-  static WrapperInfo kWrapperInfo;
-  virtual WrapperInfo* GetWrapperInfo() OVERRIDE;
+class MyObjectBlink : public Wrappable<MyObjectBlink> {
 };
 
-WrapperInfo MyObjectBlink::kWrapperInfo = { kEmbedderBlink };
-
-WrapperInfo* MyObjectBlink::GetWrapperInfo() {
-  return &kWrapperInfo;
-}
-
 
 void RegisterTemplates(v8::Isolate* isolate) {
   PerIsolateData* data = PerIsolateData::From(isolate);
-  DCHECK(data->GetObjectTemplate(&MyObject::kWrapperInfo).IsEmpty());
+  DCHECK(data->GetObjectTemplate(
+      &WrappableTraits<MyObject>::kWrapperInfo).IsEmpty());
 
   v8::Handle<v8::ObjectTemplate> templ = ObjectTemplateBuilder(isolate)
       .SetProperty("value", &MyObject::value, &MyObject::set_value)
       .Build();
   templ->SetInternalFieldCount(kNumberOfInternalFields);
-  data->SetObjectTemplate(&MyObject::kWrapperInfo, templ);
+  data->SetObjectTemplate(&WrappableTraits<MyObject>::kWrapperInfo, templ);
 
   templ = v8::ObjectTemplate::New(isolate);
   templ->SetInternalFieldCount(kNumberOfInternalFields);
-  data->SetObjectTemplate(&MyObject2::kWrapperInfo, templ);
+  data->SetObjectTemplate(&WrappableTraits<MyObject2>::kWrapperInfo, templ);
 
   templ = v8::ObjectTemplate::New(isolate);
   templ->SetInternalFieldCount(kNumberOfInternalFields);
-  data->SetObjectTemplate(&MyObjectBlink::kWrapperInfo, templ);
+  data->SetObjectTemplate(&WrappableTraits<MyObjectBlink>::kWrapperInfo, templ);
 }
 
 typedef V8Test WrappableTest;
 
 TEST_F(WrappableTest, WrapAndUnwrap) {
   v8::Isolate* isolate = instance_->isolate();
   v8::HandleScope handle_scope(isolate);
 
   RegisterTemplates(isolate);
   Handle<MyObject> obj = MyObject::Create(isolate);
@@ skipping 64 matching lines @@
   };
   func->Call(v8::Undefined(isolate), 1, argv);
   EXPECT_FALSE(try_catch.HasCaught());
   EXPECT_EQ("", try_catch.GetStackTrace());
 
   EXPECT_EQ(191, obj->value());
 }
 
 }  // namespace
 }  // namespace gin