Core: Rewrite plugin system

include/Nazara/Core/Plugin.inl

@@ -0,0 +1,82 @@
+// Copyright (C) 2022 Jérôme "Lynix" Leclercq (lynix680@gmail.com)
+// 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/Plugin.hpp>
+#include <stdexcept>
+#include <Nazara/Core/Debug.hpp>
+
+namespace Nz
+{
+	template<typename T>
+	Plugin<T>::Plugin(DynLib dynLib, std::unique_ptr<T> pluginInterface, bool isActive) :
+	m_interface(std::move(pluginInterface)),
+	m_lib(std::move(dynLib)),
+	m_isActive(isActive)
+	{
+	}
+
+	template<typename T>
+	Plugin<T>::~Plugin()
+	{
+		if (m_interface)
+		{
+			Deactivate();
+
+			// Destroys interface before freeing the library
+			m_interface.reset();
+		}
+
+		m_lib.Unload();
+	}
+
+	template<typename T>
+	bool Plugin<T>::Activate()
+	{
+		if (m_isActive)
+			return true;
+
+		if (!m_interface->Activate())
+			return false;
+
+		m_isActive = true;
+		return true;
+	}
+
+	template<typename T>
+	template<typename U>
+	Plugin<U> Plugin<T>::Cast() &&
+	{
+		return Plugin<U>(std::move(m_lib), std::unique_ptr<U>(static_cast<U*>(m_interface.release())), m_isActive);
+	}
+
+	template<typename T>
+	void Plugin<T>::Deactivate()
+	{
+		if (m_isActive)
+		{
+			m_interface->Deactivate();
+			m_isActive = false;
+		}
+	}
+
+	template<typename T>
+	const DynLib& Plugin<T>::GetDynamicLibrary() const
+	{
+		return m_lib;
+	}
+
+	template<typename T>
+	T* Plugin<T>::operator->()
+	{
+		return m_interface;
+	}
+
+	template<typename T>
+	const T* Plugin<T>::operator->() const
+	{
+		return m_interface;
+	}
+}
+
+#include <Nazara/Core/DebugOff.hpp>