Added ResourceRef (Automatic resource reference)

Former-commit-id: 97a0b2732f4dc443b8e1676e68b33b1b53ddf4fb

include/Nazara/Core/ResourceRef.hpp

@@ -0,0 +1,44 @@
+// Copyright (C) 2013 Jérôme Leclercq
+// This file is part of the "Nazara Engine - Core module"
+// For conditions of distribution and use, see copyright notice in Config.hpp
+
+#pragma once
+
+#ifndef NAZARA_RESOURCEREF_HPP
+#define NAZARA_RESOURCEREF_HPP
+
+#include <Nazara/Prerequesites.hpp>
+#include <Nazara/Core/Resource.hpp>
+#include <type_traits>
+
+template<typename T>
+class NzResourceRef
+{
+	static_assert(std::is_base_of<NzResource, T>::value, "ResourceRef should only be used with resource type");
+
+	public:
+		NzResourceRef() = default;
+		NzResourceRef(T* resource);
+		NzResourceRef(const NzResourceRef& ref);
+		NzResourceRef(NzResourceRef&& ref);
+		~NzResourceRef();
+
+		bool IsValid() const;
+		T* Release();
+		bool Reset(T* resource = nullptr);
+		NzResourceRef& Swap(NzResourceRef& ref);
+
+		operator bool() const;
+		operator T*() const;
+		T* operator->() const;
+
+		NzResourceRef& operator=(const NzResourceRef& ref);
+		NzResourceRef& operator=(NzResourceRef&& ref);
+
+	private:
+		T* m_resource = nullptr;
+};
+
+#include <Nazara/Core/ResourceRef.inl>
+
+#endif // NAZARA_RESOURCEREF_HPP