Add WeakMap built-in module.

common/api/atom_api_id_weak_map.h

@@ -0,0 +1,51 @@
+// Copyright (c) 2013 GitHub, Inc. All rights reserved.
+// Copyright (c) 2012 Intel Corp. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef ATOM_BROWSER_API_ATOM_API_ID_WEAK_MAP_H_
+#define ATOM_BROWSER_API_ATOM_API_ID_WEAK_MAP_H_
+
+#include <map>
+
+#include "base/basictypes.h"
+#include "vendor/node/src/node_object_wrap.h"
+
+namespace atom {
+
+namespace api {
+
+class IDWeakMap : public node::ObjectWrap {
+ public:
+  static void Initialize(v8::Handle<v8::Object> target);
+
+ private:
+  IDWeakMap();
+  virtual ~IDWeakMap();
+
+  bool Has(int key) const;
+  void Erase(v8::Isolate* isolate, int key);
+  int GetNextID();
+
+  static void WeakCallback(v8::Isolate* isolate,
+                           v8::Persistent<v8::Value> value,
+                           void *data);
+
+  static v8::Handle<v8::Value> New(const v8::Arguments& args);
+  static v8::Handle<v8::Value> Add(const v8::Arguments& args);
+  static v8::Handle<v8::Value> Get(const v8::Arguments& args);
+  static v8::Handle<v8::Value> Has(const v8::Arguments& args);
+  static v8::Handle<v8::Value> Remove(const v8::Arguments& args);
+
+  int nextId_;
+
+  std::map<int, v8::Persistent<v8::Value>> map_;
+
+  DISALLOW_COPY_AND_ASSIGN(IDWeakMap);
+};
+
+}  // namespace api
+
+}  // namespace atom
+
+#endif  // ATOM_BROWSER_API_ATOM_API_ID_WEAK_MAP_H_