Introduce a base class for system models

src/openrct2/System.hpp

@@ -0,0 +1,60 @@
+/*****************************************************************************
+ * Copyright (c) 2014-2021 OpenRCT2 developers
+ *
+ * For a complete list of all authors, please refer to contributors.md
+ * Interested in contributing? Visit https://github.com/OpenRCT2/OpenRCT2
+ *
+ * OpenRCT2 is licensed under the GNU General Public License version 3.
+ *****************************************************************************/
+
+#pragma once
+
+namespace OpenRCT2
+{
+    struct IContext;
+
+    // Base class for systems that are hosted in the Context.
+    class System
+    {
+        IContext& _context;
+
+    public:
+        System(IContext& owner)
+            : _context(owner)
+        {
+        }
+
+        virtual ~System() = default;
+
+        // Called before a tick.
+        virtual void PreTick()
+        {
+        }
+
+        // Called every game tick, which by default is 40hz.
+        virtual void Tick()
+        {
+        }
+
+        // Called after a tick.
+        virtual void PostTick()
+        {
+        }
+
+        // Called every frame.
+        virtual void Update()
+        {
+        }
+
+        IContext& GetContext()
+        {
+            return _context;
+        }
+
+        const IContext& GetContext() const
+        {
+            return _context;
+        }
+    };
+
+} // namespace OpenRCT2

src/openrct2/libopenrct2.vcxproj

@@ -436,6 +436,7 @@
     <ClInclude Include="scripting\bindings\network\ScSocket.hpp" />
     <ClInclude Include="scripting\bindings\world\ScTile.hpp" />
     <ClInclude Include="sprites.h" />
+    <ClInclude Include="System.hpp" />
     <ClInclude Include="title\TitleScreen.h" />
     <ClInclude Include="title\TitleSequence.h" />
     <ClInclude Include="title\TitleSequenceManager.h" />