1 files changed, 57 insertions, 0 deletions
diff --git a/yage/entity/system.h b/yage/entity/system.h
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index 00000000..9100fa17
--- /dev/null
+++ b/yage/entity/system.h
@@ -0,0 +1,57 @@
+/** ---------------------------------------------------------------------------
+ * @file: system.h
+ *
+ * Copyright (c) 2017 Yann Herklotz Grave <ymherklotz@gmail.com>
+ * MIT License, see LICENSE file for more details.
+ * ----------------------------------------------------------------------------
+ */
+
+#ifndef YAGE_ENGINE_SYSTEM_H
+#define YAGE_ENGINE_SYSTEM_H
+
+namespace yage
+{
+
+/**
+ * System interface for the different systems in the engine.
+ */
+class System
+{
+public:
+    /**
+     * Virtual destructor to destroy all the objects that implement this
+     * properly.
+     */
+    virtual ~System() = 0;
+
+    /**
+     * Initializes the system. Good practice to have this function instead
+     * using the constructor.
+     */
+    virtual void init() = 0;
+
+    /**
+     * Updates the system at each interval using the time step.
+     *
+     * @param dt The time difference between the previous frame and the current one.
+     */
+    virtual void update(double dt) = 0;
+
+    /**
+     * Destroy the system and the components that are contained in it.
+     */
+    virtual void destroy() = 0;
+};
+
+/**
+ * Implement the default destructor, but leaving it as purely virtual in the
+ * definition of the abstract class. This is so that the classes that implement
+ * the abstract class have to implement a desctructor, but at the same time,
+ * that there is no undefined behavious when the stack unwinds to the system and
+ * calls the system destructor.
+ */
+inline System::~System() {}
+
+} // namespace yage
+
+#endif