From 728ea54a222849f4b2c74e7e4391a21e141b3e79 Mon Sep 17 00:00:00 2001
From: Jens Nolte <jens@nightmarestudio.de>
Date: Sun, 28 Jun 2020 01:54:09 +0200
Subject: [PATCH] Add callback template
---
qthing/include/qthing/callback.hpp | 35 ++++++++++++++++++++++++++++++
1 file changed, 35 insertions(+)
create mode 100644 qthing/include/qthing/callback.hpp
diff --git a/qthing/include/qthing/callback.hpp b/qthing/include/qthing/callback.hpp
new file mode 100644
index 0000000..288607d
--- /dev/null
+++ b/qthing/include/qthing/callback.hpp
@@ -0,0 +1,35 @@
+#pragma once
+
+#include <functional>
+
+namespace qthing {
+
+template <typename... Args>
+class Callback {
+ private:
+ using CallbackType = std::function<void(Args...)>;
+ mutable CallbackType callback = NULL;
+
+ public:
+ Callback(){};
+
+ void add(CallbackType newCallback) const {
+ if (callback == NULL) {
+ callback = newCallback;
+ } else {
+ auto oldCallback = callback;
+ callback = [newCallback, oldCallback](Args&&... args) {
+ oldCallback(std::forward<Args>(args)...);
+ newCallback(std::forward<Args>(args)...);
+ };
+ }
+ }
+
+ void operator()(Args&&... args) const {
+ if (callback != NULL) {
+ callback(std::forward<Args>(args)...);
+ }
+ }
+};
+
+} // namespace qthing
--
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