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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.
#include <string>
#include <utility>
#include "base/macros.h"
#include "mojo/public/cpp/bindings/scoped_interface_endpoint_handle.h"
namespace mojo {
// 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 {
// Constructs an empty AssociatedInterfaceRequest, representing that the
// client is not requesting an implementation of Interface.
AssociatedInterfaceRequest() {}
AssociatedInterfaceRequest(decltype(nullptr)) {}
explicit AssociatedInterfaceRequest(ScopedInterfaceEndpointHandle handle)
: handle_(std::move(handle)) {}
// 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)) {
return *this;
// Indicates whether the request currently contains a valid interface endpoint
// handle.
bool is_pending() const { return handle_.is_valid(); }
explicit operator bool() const { return handle_; }
ScopedInterfaceEndpointHandle PassHandle() { return std::move(handle_); }
const ScopedInterfaceEndpointHandle& handle() const { return handle_; }
bool Equals(const AssociatedInterfaceRequest& other) const {
if (this == &other)
return true;
// Now that the two refer to different objects, they are equivalent if
// and only if they are both invalid.
return !is_pending() && !other.is_pending();
void ResetWithReason(uint32_t custom_reason, const std::string& description) {
handle_.ResetWithReason(custom_reason, description);
ScopedInterfaceEndpointHandle handle_;
} // namespace mojo