Added ResourceListenerWrapper

This class wraps the call to
Resource::AddResourceListener/RemoveResourceListener using RAII and help
a lot with some of the dependencies.
Thanks to this, the render queues now handle their resources listening
properly.

Former-commit-id: 7f215ffa4ccadcc4f44f777656970e92ce01087a

include/Nazara/Core/ResourceListenerWrapper.hpp

@@ -0,0 +1,45 @@
+// Copyright (C) 2015 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_RESOURCELISTENERWRAPPER_HPP
+#define NAZARA_RESOURCELISTENERWRAPPER_HPP
+
+#include <Nazara/Prerequesites.hpp>
+#include <Nazara/Core/Resource.hpp>
+#include <Nazara/Core/ResourceListener.hpp>
+#include <type_traits>
+
+template<typename T>
+class NzResourceListenerWrapper
+{
+	static_assert(std::is_base_of<NzResource, T>::value, "ResourceRef should only be used with resource type");
+
+	public:
+		NzResourceListenerWrapper(NzResourceListener* listener, int index = 0, T* resource = nullptr);
+		NzResourceListenerWrapper(const NzResourceListenerWrapper& listener);
+		NzResourceListenerWrapper(NzResourceListenerWrapper&& listener);
+		~NzResourceListenerWrapper();
+
+		bool IsValid() const;
+		void Reset(T* resource = nullptr);
+
+		operator bool() const;
+		operator T*() const;
+		T* operator->() const;
+
+		NzResourceListenerWrapper& operator=(T* resource);
+		NzResourceListenerWrapper& operator=(const NzResourceListenerWrapper& listener);
+		NzResourceListenerWrapper& operator=(NzResourceListenerWrapper&& listener);
+
+	private:
+		T* m_resource;
+		NzResourceListener* m_listener;
+		int m_index;
+};
+
+#include <Nazara/Core/ResourceListenerWrapper.inl>
+
+#endif // NAZARA_RESOURCELISTENERWRAPPER_HPP

include/Nazara/Core/ResourceListenerWrapper.inl

@@ -0,0 +1,108 @@
+// Copyright (C) 2015 Jérôme Leclercq
+// This file is part of the "Nazara Engine - Core module"
+// For conditions of distribution and use, see copyright notice in Config.hpp
+
+#include <Nazara/Core/Debug.hpp>
+
+template<typename T>
+NzResourceListenerWrapper<T>::NzResourceListenerWrapper(NzResourceListener* listener, int index, T* resource) :
+m_resource(nullptr),
+m_listener(listener),
+m_index(index)
+{
+	Reset(resource);
+}
+
+template<typename T>
+NzResourceListenerWrapper<T>::NzResourceListenerWrapper(const NzResourceListenerWrapper& listener) :
+m_resource(nullptr),
+m_listener(listener.m_listener),
+m_index(listener.m_index)
+{
+	Reset(listener.m_resource);
+}
+
+template<typename T>
+NzResourceListenerWrapper<T>::NzResourceListenerWrapper(NzResourceListenerWrapper&& listener) :
+m_resource(listener.m_resource),
+m_listener(listener.m_listener),
+m_index(listener.m_index)
+{
+	listener.m_resource = nullptr;
+}
+
+template<typename T>
+NzResourceListenerWrapper<T>::~NzResourceListenerWrapper()
+{
+	Reset(nullptr);
+}
+
+template<typename T>
+bool NzResourceListenerWrapper<T>::IsValid() const
+{
+	return m_resource != nullptr;
+}
+
+template<typename T>
+void NzResourceListenerWrapper<T>::Reset(T* resource)
+{
+	if (resource)
+		resource->AddResourceListener(m_listener, m_index);
+
+	if (m_resource)
+		m_resource->RemoveResourceListener(m_listener);
+
+	m_resource = resource;
+}
+
+template<typename T>
+NzResourceListenerWrapper<T>::operator bool() const
+{
+	return IsValid();
+}
+
+template<typename T>
+NzResourceListenerWrapper<T>::operator T*() const
+{
+	return m_resource;
+}
+
+template<typename T>
+T* NzResourceListenerWrapper<T>::operator->() const
+{
+	return m_resource;
+}
+
+template<typename T>
+NzResourceListenerWrapper<T>& NzResourceListenerWrapper<T>::operator=(T* resource)
+{
+	Reset(resource);
+
+	return *this;
+}
+
+template<typename T>
+NzResourceListenerWrapper<T>& NzResourceListenerWrapper<T>::operator=(const NzResourceListenerWrapper& listener)
+{
+	m_index = listener.m_index;
+	m_listener = listener.m_listener;
+	Reset(listener.m_resource);
+
+	return *this;
+}
+
+template<typename T>
+NzResourceListenerWrapper<T>& NzResourceListenerWrapper<T>::operator=(NzResourceListenerWrapper&& listener)
+{
+	Reset();
+
+	m_index = listener.m_index;
+	m_listener = listener.m_listener;
+	m_resource = listener.m_resource;
+
+	listener.m_resource = nullptr;
+
+	return *this;
+}
+
+#include <Nazara/Core/DebugOff.hpp>