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// 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.
#ifndef MOJO_PUBLIC_CPP_BINDINGS_LIB_SHARED_PTR_H_
#define MOJO_PUBLIC_CPP_BINDINGS_LIB_SHARED_PTR_H_
#include "mojo/public/cpp/bindings/lib/shared_data.h"
namespace mojo {
namespace internal {
// Used to manage a heap-allocated instance of P that can be shared via
// reference counting. When the last reference is dropped, the instance is
// deleted.
template <typename P>
class SharedPtr {
public:
SharedPtr() {}
explicit SharedPtr(P* ptr) {
impl_.mutable_value()->ptr = ptr;
}
// Default copy-constructor and assignment operator are OK.
P* get() {
return impl_.value().ptr;
}
const P* get() const {
return impl_.value().ptr;
}
P* operator->() { return get(); }
const P* operator->() const { return get(); }
private:
class Impl {
public:
~Impl() {
if (ptr)
delete ptr;
}
Impl() : ptr(NULL) {
}
Impl(P* ptr) : ptr(ptr) {
}
P* ptr;
private:
MOJO_DISALLOW_COPY_AND_ASSIGN(Impl);
};
SharedData<Impl> impl_;
};
} // namespace mojo
} // namespace internal
#endif // MOJO_PUBLIC_CPP_BINDINGS_LIB_SHARED_PTR_H_
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