Introduce QXmppTask & QXmppPromise

Closes #502.

Co-authored-by: Jonah Brüchert <jbb@kaidan.im>

1 files changed, 85 insertions, 0 deletions

diff --git a/src/base/QXmppTask.cpp b/src/base/QXmppTask.cpp
new file mode 100644
index 00000000..c17a6e4f
--- /dev/null
+++ b/src/base/QXmppTask.cpp
@@ -0,0 +1,85 @@
+// SPDX-FileCopyrightText: 2023 Linus Jahn <lnj@kaidan.im>
+//
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
+#include "QXmppTask.h"
+
+#include <QDebug>
+
+namespace QXmpp::Private {
+
+struct TaskData
+{
+    QPointer<QObject> context;
+    std::function<void(TaskPrivate &, void *)> continuation;
+    void *result = nullptr;
+    void (*freeResult)(void *);
+    bool finished = false;
+
+    ~TaskData()
+    {
+        if (freeResult) {
+            freeResult(result);
+        }
+    }
+};
+
+}  // namespace QXmpp::Private
+
+QXmpp::Private::TaskPrivate::TaskPrivate(void (*freeResult)(void *))
+    : d(std::make_shared<QXmpp::Private::TaskData>())
+{
+    d->freeResult = freeResult;
+}
+
+QXmpp::Private::TaskPrivate::~TaskPrivate()
+{
+}
+
+bool QXmpp::Private::TaskPrivate::isFinished() const
+{
+    return d->finished;
+}
+
+void QXmpp::Private::TaskPrivate::setFinished(bool finished)
+{
+    d->finished = finished;
+}
+
+bool QXmpp::Private::TaskPrivate::isContextAlive()
+{
+    return !d->context.isNull();
+}
+
+void QXmpp::Private::TaskPrivate::setContext(QObject *obj)
+{
+    d->context = obj;
+}
+
+void *QXmpp::Private::TaskPrivate::result() const
+{
+    return d->result;
+}
+
+void QXmpp::Private::TaskPrivate::setResult(void *result)
+{
+    if (d->freeResult) {
+        d->freeResult(d->result);
+    }
+    d->result = result;
+}
+
+const std::function<void(QXmpp::Private::TaskPrivate &, void *)> QXmpp::Private::TaskPrivate::continuation() const
+{
+    return d->continuation;
+}
+
+void QXmpp::Private::TaskPrivate::setContinuation(std::function<void(TaskPrivate &, void *)> &&continuation)
+{
+    d->continuation = continuation;
+}
+
+void QXmpp::Private::TaskPrivate::invokeContinuation(void *result)
+{
+    d->continuation(*this, result);
+}