Index: content/renderer/possibly_associated_interface_ptr.h |
diff --git a/content/renderer/possibly_associated_interface_ptr.h b/content/renderer/possibly_associated_interface_ptr.h |
new file mode 100644 |
index 0000000000000000000000000000000000000000..9e30892b854065df82363e89e27589294f457ee6 |
--- /dev/null |
+++ b/content/renderer/possibly_associated_interface_ptr.h |
@@ -0,0 +1,57 @@ |
+// Copyright 2017 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. |
+ |
+#ifndef CONTENT_RENDERER_POSSIBLY_ASSOCIATED_INTERFACE_PTR_H_ |
+#define CONTENT_RENDERER_POSSIBLY_ASSOCIATED_INTERFACE_PTR_H_ |
+ |
+#include "base/macros.h" |
+#include "mojo/public/cpp/bindings/associated_interface_ptr.h" |
+#include "mojo/public/cpp/bindings/interface_ptr.h" |
+ |
+namespace content { |
+ |
+// PossiblyAssociatedInterfacePtr<T> contains mojo::InterfacePtr<T> or |
+// mojo::AssociatedInterfacePtr<T>, but not both. Mojo-related functions in |
+// mojo::InterfacePtr<T> and mojo::AssociatedInterfacePtr<T> are not accessible, |
+// but a user can access the raw pointer to the interface. |
+template <typename T> |
+class PossiblyAssociatedInterfacePtr final { |
+ public: |
+ PossiblyAssociatedInterfacePtr() {} |
+ PossiblyAssociatedInterfacePtr(std::nullptr_t) {} |
+ PossiblyAssociatedInterfacePtr(mojo::InterfacePtr<T> independent_ptr) |
+ : independent_ptr_(std::move(independent_ptr)) {} |
+ PossiblyAssociatedInterfacePtr(mojo::AssociatedInterfacePtr<T> associated_ptr) |
+ : associated_ptr_(std::move(associated_ptr)) {} |
+ |
+ PossiblyAssociatedInterfacePtr(PossiblyAssociatedInterfacePtr&& other) { |
+ independent_ptr_ = std::move(other.independent_ptr_); |
+ associated_ptr_ = std::move(other.associated_ptr_); |
+ } |
+ ~PossiblyAssociatedInterfacePtr() {} |
+ |
+ PossiblyAssociatedInterfacePtr& operator=( |
+ PossiblyAssociatedInterfacePtr&& other) { |
+ independent_ptr_ = std::move(other.independent_ptr_); |
+ associated_ptr_ = std::move(other.associated_ptr_); |
+ return *this; |
+ } |
+ |
+ T* get() const { |
+ return independent_ptr_ ? independent_ptr_.get() : associated_ptr_.get(); |
+ } |
+ T* operator->() const { return get(); } |
+ T& operator*() const { return *get(); } |
+ explicit operator bool() const { return get(); } |
+ |
+ private: |
+ mojo::InterfacePtr<T> independent_ptr_; |
+ mojo::AssociatedInterfacePtr<T> associated_ptr_; |
+ |
+ DISALLOW_COPY_AND_ASSIGN(PossiblyAssociatedInterfacePtr); |
+}; |
+ |
+} // namespace content |
+ |
+#endif // CONTENT_RENDERER_POSSIBLY_ASSOCIATED_INTERFACE_PTR_H_ |