some work on pad emulation (WIP)

src/Emulator/Util/singleton.h

@@ -0,0 +1,24 @@
+#pragma once
+
+#include <cstdlib>
+#include <new>
+
+template <class T>
+class singleton {
+  public:
+    static T* instance() {
+        if (!m_instance) {
+            m_instance = static_cast<T*>(std::malloc(sizeof(T)));
+            new (m_instance) T;
+        }
+
+        return m_instance;
+    }
+
+  protected:
+    singleton();
+    ~singleton();
+
+  private:
+    static inline T* m_instance = nullptr;
+};