From bb4bf1cd1ea2dec38329c65a4565d28e674ff23b Mon Sep 17 00:00:00 2001
From: Linus Jahn <lnj@kaidan.im>
Date: Fri, 27 Aug 2021 22:07:26 +0200
Subject: FutureUtils: Add awaitLast using last future result

---
 src/base/QXmppFutureUtils_p.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'src')

diff --git a/src/base/QXmppFutureUtils_p.h b/src/base/QXmppFutureUtils_p.h
index 720e6df4..0cad95f5 100644
--- a/src/base/QXmppFutureUtils_p.h
+++ b/src/base/QXmppFutureUtils_p.h
@@ -82,6 +82,19 @@ inline QFuture<void> makeReadyFuture()
     return QFutureInterface<void>(State(State::Started | State::Finished)).future();
 }
 
+template<typename T, typename Handler>
+void awaitLast(const QFuture<T> &future, QObject *context, Handler handler)
+{
+    auto *watcher = new QFutureWatcher<T>(context);
+    QObject::connect(watcher, &QFutureWatcherBase::finished,
+                     context, [watcher, handler { std::move(handler) }]() {
+        auto future = watcher->future();
+        handler(future.resultAt(future.resultCount() - 1));
+        watcher->deleteLater();
+    });
+    watcher->setFuture(future);
+}
+
 template<typename T, typename Handler>
 void await(const QFuture<T> &future, QObject *context, Handler handler)
 {
-- 
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