Add new shared pointer and make use of it

arm9/source/core/RefCount.h

@@ -0,0 +1,58 @@
+#pragma once
+#include <array>
+
+extern "C" void shared_ptr_increase_ref_count(vu32& refCount);
+
+class RefCount
+{
+public:
+    vu32 refCount;
+    vu32 weakRefCount;
+
+    virtual ~RefCount() = default;
+
+    virtual void DestructObject() = 0;
+
+protected:
+    explicit RefCount()
+        : refCount(1), weakRefCount(0) { }
+};
+
+template <class T>
+class StandaloneRefCount : public RefCount
+{
+public:
+    explicit StandaloneRefCount(T* object)
+        : _object(object) { }
+
+    void DestructObject() final
+    {
+        delete _object;
+    }
+
+private:
+    T* _object;
+};
+
+template <class T>
+class alignas(T) MakeSharedRefCount : public RefCount
+{
+public:
+    explicit MakeSharedRefCount(auto&&... args)
+    {
+        new (_object.data()) T(std::forward<decltype(args)>(args)...);
+    }
+
+    T* GetObject()
+    {
+        return reinterpret_cast<T*>(_object.data());
+    }
+
+    void DestructObject() final
+    {
+        reinterpret_cast<T*>(_object.data())->~T();
+    }
+
+private:
+    std::array<u8, sizeof(T)> _object alignas(T);
+};