1 files changed, 48 insertions, 0 deletions
diff --git a/cast/sender/public/cast_app_discovery_service.cc b/cast/sender/public/cast_app_discovery_service.cc
new file mode 100644
index 00000000..c561b386
--- /dev/null
+++ b/cast/sender/public/cast_app_discovery_service.cc
@@ -0,0 +1,48 @@
+// Copyright 2020 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 "cast/sender/public/cast_app_discovery_service.h"
+
+namespace openscreen {
+namespace cast {
+
+CastAppDiscoveryService::Subscription::Subscription(
+    CastAppDiscoveryService* discovery_service,
+    uint32_t id)
+    : discovery_service_(discovery_service), id_(id) {}
+
+CastAppDiscoveryService::Subscription::Subscription(Subscription&& other)
+    : discovery_service_(other.discovery_service_), id_(other.id_) {
+  other.discovery_service_ = nullptr;
+}
+
+CastAppDiscoveryService::Subscription::~Subscription() {
+  Reset();
+}
+
+CastAppDiscoveryService::Subscription& CastAppDiscoveryService::Subscription::
+operator=(Subscription other) {
+  Swap(other);
+  return *this;
+}
+
+void CastAppDiscoveryService::Subscription::Reset() {
+  if (discovery_service_) {
+    discovery_service_->RemoveAvailabilityCallback(id_);
+  }
+  discovery_service_ = nullptr;
+}
+
+void CastAppDiscoveryService::Subscription::Swap(Subscription& other) {
+  CastAppDiscoveryService* service = other.discovery_service_;
+  other.discovery_service_ = discovery_service_;
+  discovery_service_ = service;
+
+  uint32_t id = other.id_;
+  other.id_ = id_;
+  id_ = id;
+}
+
+}  // namespace cast
+}  // namespace openscreen