added iOS source code

[wl-app.git] / iOS / Pods / Realm / Realm / ObjectStore / src / collection_notifications.cpp

diff --git a/iOS/Pods/Realm/Realm/ObjectStore/src/collection_notifications.cpp b/iOS/Pods/Realm/Realm/ObjectStore/src/collection_notifications.cpp
new file mode 100644 (file)
index 0000000..03fad73
--- /dev/null
+++ b/iOS/Pods/Realm/Realm/ObjectStore/src/collection_notifications.cpp
@@ -0,0 +1,61 @@
+////////////////////////////////////////////////////////////////////////////
+//
+// Copyright 2016 Realm Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+////////////////////////////////////////////////////////////////////////////
+
+#include "collection_notifications.hpp"
+
+#include "impl/collection_notifier.hpp"
+
+using namespace realm;
+using namespace realm::_impl;
+
+NotificationToken::NotificationToken(std::shared_ptr<_impl::CollectionNotifier> notifier, uint64_t token)
+: m_notifier(std::move(notifier)), m_token(token)
+{
+}
+
+NotificationToken::~NotificationToken()
+{
+    // m_notifier itself (and not just the pointed-to thing) needs to be accessed
+    // atomically to ensure that there are no data races when the token is
+    // destroyed after being modified on a different thread.
+    // This is needed despite the token not being thread-safe in general as
+    // users find it very surprising for obj-c objects to care about what
+    // thread they are deallocated on.
+    if (auto notifier = m_notifier.exchange({})) {
+        notifier->remove_callback(m_token);
+    }
+}
+
+NotificationToken::NotificationToken(NotificationToken&&) = default;
+
+NotificationToken& NotificationToken::operator=(realm::NotificationToken&& rgt)
+{
+    if (this != &rgt) {
+        if (auto notifier = m_notifier.exchange({})) {
+            notifier->remove_callback(m_token);
+        }
+        m_notifier = std::move(rgt.m_notifier);
+        m_token = rgt.m_token;
+    }
+    return *this;
+}
+
+void NotificationToken::suppress_next()
+{
+    m_notifier.load()->suppress_next_notification(m_token);
+}