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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_ASSOCIATED_INTERFACE_REQUEST_H_
#define MOJO_PUBLIC_CPP_BINDINGS_ASSOCIATED_INTERFACE_REQUEST_H_
#include <utility>
#include "base/macros.h"
#include "mojo/public/cpp/bindings/lib/scoped_interface_endpoint_handle.h"
namespace mojo {
namespace internal {
class AssociatedInterfaceRequestHelper;
}
// AssociatedInterfaceRequest represents an associated interface request. It is
// similar to InterfaceRequest except that it doesn't own a message pipe handle.
template <typename Interface>
class AssociatedInterfaceRequest {
DISALLOW_COPY_AND_ASSIGN_WITH_MOVE_FOR_BIND(AssociatedInterfaceRequest);
public:
// Constructs an empty AssociatedInterfaceRequest, representing that the
// client is not requesting an implementation of Interface.
AssociatedInterfaceRequest() {}
AssociatedInterfaceRequest(decltype(nullptr)) {}
// Takes the interface endpoint handle from another
// AssociatedInterfaceRequest.
AssociatedInterfaceRequest(AssociatedInterfaceRequest&& other) {
handle_ = std::move(other.handle_);
}
AssociatedInterfaceRequest& operator=(AssociatedInterfaceRequest&& other) {
if (this != &other)
handle_ = std::move(other.handle_);
return *this;
}
// Assigning to nullptr resets the AssociatedInterfaceRequest to an empty
// state, closing the interface endpoint handle currently bound to it (if
// any).
AssociatedInterfaceRequest& operator=(decltype(nullptr)) {
handle_.reset();
return *this;
}
// Indicates whether the request currently contains a valid interface endpoint
// handle.
bool is_pending() const { return handle_.is_valid(); }
private:
friend class internal::AssociatedInterfaceRequestHelper;
internal::ScopedInterfaceEndpointHandle handle_;
};
namespace internal {
// With this helper, AssociatedInterfaceRequest doesn't have to expose any
// operations related to ScopedInterfaceEndpointHandle, which is an internal
// class.
class AssociatedInterfaceRequestHelper {
public:
template <typename Interface>
static ScopedInterfaceEndpointHandle PassHandle(
AssociatedInterfaceRequest<Interface>* request) {
return std::move(request->handle_);
}
template <typename Interface>
static const ScopedInterfaceEndpointHandle& GetHandle(
AssociatedInterfaceRequest<Interface>* request) {
return request->handle_;
}
template <typename Interface>
static void SetHandle(AssociatedInterfaceRequest<Interface>* request,
ScopedInterfaceEndpointHandle handle) {
request->handle_ = std::move(handle);
}
};
} // namespace internal
} // namespace mojo
#endif // MOJO_PUBLIC_CPP_BINDINGS_ASSOCIATED_INTERFACE_REQUEST_H_
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