I just made C++ God and it's scary

src/dawn/state/StateProperty.hpp

@@ -0,0 +1,49 @@
+// Copyright (c) 2023 Dominic Masters
+// 
+// This software is released under the MIT License.
+// https://opensource.org/licenses/MIT
+
+#pragma once
+#include "StateOwner.hpp"
+
+namespace Dawn {
+  template<class V>
+  class StateProperty {
+    private:
+      StateOwner *owner;
+      V value;
+      
+      void setInternal(V val) {
+        if(val == this->value) return;// TODO: can I omit this? kinda bad tbh.
+        assertNotNull(this->owner);
+        auto old = this->value;
+        this->value = val;
+        this->owner->onStatePropertyUpdated(this, val, old);
+      }
+
+    public:
+      const StateProperty& operator += (const V &value) {
+        this->setInternal(this->value + value);
+        return *this;
+      }
+
+      const bool_t operator != (const V &value) {
+        return value != this->value;
+      }
+
+      const bool_t operator == (const V &value) {
+        return value == this->value;
+      }
+
+      const StateProperty& operator = (const V &val) {
+        this->setInternal(val);
+        return *this;
+      }
+
+      operator V() const {
+        return this->value;
+      }
+
+      friend class StateOwner;
+  };
+}