From 79daeb5a7536d00d0273158daff0ffac3c12291c Mon Sep 17 00:00:00 2001
From: Michael Fabian 'Xaymar' Dirks <info@xaymar.com>
Date: Thu, 8 Nov 2018 08:07:49 +0100
Subject: [PATCH] util-event: Template event handler class

---
 CMakeLists.txt        |  2 ++
 source/util-event.cpp | 20 +++++++++++++
 source/util-event.hpp | 65 +++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 87 insertions(+)
 create mode 100644 source/util-event.cpp
 create mode 100644 source/util-event.hpp

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5f9f2285..e161f196 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -264,6 +264,8 @@ SET(PROJECT_PRIVATE
 	"${PROJECT_SOURCE_DIR}/source/strings.h"
 	"${PROJECT_SOURCE_DIR}/source/utility.h"
 	"${PROJECT_SOURCE_DIR}/source/utility.cpp"
+	"${PROJECT_SOURCE_DIR}/source/util-event.hpp"
+	"${PROJECT_SOURCE_DIR}/source/util-event.cpp"
 	"${PROJECT_SOURCE_DIR}/source/util-math.h"
 	"${PROJECT_SOURCE_DIR}/source/util-math.cpp"
 	"${PROJECT_SOURCE_DIR}/source/util-memory.h"
diff --git a/source/util-event.cpp b/source/util-event.cpp
new file mode 100644
index 00000000..12fb7c77
--- /dev/null
+++ b/source/util-event.cpp
@@ -0,0 +1,20 @@
+/*
+* Modern effects for a modern Streamer
+* Copyright (C) 2017 Michael Fabian Dirks
+*
+* This program is free software; you can redistribute it and/or modify
+* it under the terms of the GNU General Public License as published by
+* the Free Software Foundation; either version 2 of the License, or
+* (at your option) any later version.
+*
+* This program is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+* GNU General Public License for more details.
+*
+* You should have received a copy of the GNU General Public License
+* along with this program; if not, write to the Free Software
+* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+*/
+
+#include "util-event.hpp"
diff --git a/source/util-event.hpp b/source/util-event.hpp
new file mode 100644
index 00000000..815f50b6
--- /dev/null
+++ b/source/util-event.hpp
@@ -0,0 +1,65 @@
+/*
+ * Modern effects for a modern Streamer
+ * Copyright (C) 2017 Michael Fabian Dirks
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ */
+
+#pragma once
+#include <functional>
+#include <list>
+
+namespace util {
+	template<typename... _args>
+	class event {
+		std::list<std::function<void(_args...)>> listeners;
+
+		public:
+		void add(std::function<void(_args...)> listener)
+		{
+			listeners.push_back(listener);
+		}
+
+		void remove(std::function<void(_args...)> listener)
+		{
+			listeners.remove(listener);
+		}
+
+		// Not valid without the extra template.
+		template<typename... _largs>
+		void operator()(_args... args)
+		{
+			for (auto& l : listeners) {
+				l(args...);
+			}
+		}
+
+		operator bool()
+		{
+			return !listeners.empty();
+		}
+
+		public:
+		bool empty()
+		{
+			return listeners.empty();
+		}
+
+		void clear()
+		{
+			listeners.clear();
+		}
+	};
+}; // namespace util