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// Copyright 2015 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_INTERFACE_PTR_INFO_H_
#define MOJO_PUBLIC_CPP_BINDINGS_INTERFACE_PTR_INFO_H_
#include <cstddef>
#include "mojo/public/cpp/system/macros.h"
#include "mojo/public/cpp/system/message_pipe.h"
namespace mojo {
template <typename Interface>
class InterfacePtr;
template <typename Interface>
class SynchronousInterfacePtr;
// InterfaceHandle stores necessary information to communicate with a remote
// interface implementation, which could be used to construct an InterfacePtr.
template <typename Interface>
class InterfaceHandle {
public:
InterfaceHandle() : version_(0u) {}
InterfaceHandle(std::nullptr_t) : version_(0u) {}
InterfaceHandle(ScopedMessagePipeHandle handle, uint32_t version)
: handle_(handle.Pass()), version_(version) {}
InterfaceHandle(InterfaceHandle&& other)
: handle_(other.handle_.Pass()), version_(other.version_) {
other.version_ = 0u;
}
// Making this constructor templated ensures that it is not type-instantiated
// unless it is used, making the InterfacePtr<->InterfaceHandle codependency
// less fragile.
template <typename SameInterfaceAsAbove = Interface>
InterfaceHandle(InterfacePtr<SameInterfaceAsAbove>&& ptr) {
*this = ptr.PassInterfaceHandle();
}
// Making this constructor templated ensures that it is not type-instantiated
// unless it is used, making the SynchronousInterfacePtr<->InterfaceHandle
// codependency less fragile.
template <typename SameInterfaceAsAbove = Interface>
InterfaceHandle(SynchronousInterfacePtr<SameInterfaceAsAbove>&& ptr) {
*this = ptr.PassInterfaceHandle();
}
~InterfaceHandle() {}
InterfaceHandle& operator=(InterfaceHandle&& other) {
if (this != &other) {
handle_ = other.handle_.Pass();
version_ = other.version_;
other.version_ = 0u;
}
return *this;
}
// Tests as true if we have a valid handle.
explicit operator bool() const { return is_valid(); }
bool is_valid() const { return handle_.is_valid(); }
ScopedMessagePipeHandle PassHandle() { return handle_.Pass(); }
const ScopedMessagePipeHandle& handle() const { return handle_; }
void set_handle(ScopedMessagePipeHandle handle) { handle_ = handle.Pass(); }
uint32_t version() const { return version_; }
void set_version(uint32_t version) { version_ = version; }
private:
ScopedMessagePipeHandle handle_;
uint32_t version_;
MOJO_MOVE_ONLY_TYPE(InterfaceHandle);
};
} // namespace mojo
#endif // MOJO_PUBLIC_CPP_BINDINGS_INTERFACE_PTR_INFO_H_