kev/Drawer/Module/GeoSigmaDraw/ClassFactory.h

#include <string>
#include <map>
#include <unordered_map>
#include <functional>
#include <type_traits>

/**
 * ͨ<EFBFBD><EFBFBD><EFBFBD>ַ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ĺ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>࣬<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ĺ<EFBFBD><EFBFBD><EFBFBD>ȫ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>С<EFBFBD>ӷ<EFBFBD><EFBFBD>ˣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ӷ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ǻ<EFBFBD> MFC <EFBFBD><EFBFBD>ײ<EFBFBD><EFBFBD>
 */
class ClassFactory
{
public:
	static ClassFactory& getInstance()
	{
		static ClassFactory factor;
		return factor;
	}

	/**
	 * ע<EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	 * \param T <EFBFBD>౾<EFBFBD><EFBFBD>
	 * \param name <EFBFBD><EFBFBD><EFBFBD>ƣ<EFBFBD>CreateObject ʱͨ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	 */
	template<typename T>
	void registerClass(const std::string& name)
	{
		static_assert(std::is_class<T>::value);

		auto f = []() { return new T(); };
		m_map[name] = f;
	}

	/**
	 * ע<EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	 * <EFBFBD>ṩһ<EFBFBD><EFBFBD>ͨ<EFBFBD><EFBFBD> typeid name ע<EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>÷<EFBFBD>
	 * 
	 */
	template <typename T>
	void registerClass()
	{
		registerClass<T>(typeid(T).name());
	}

	/**
	 * ע<EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	 * \param T <EFBFBD>౾<EFBFBD><EFBFBD>
	 * \param Args	<EFBFBD>๹<EFBFBD>캯<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ĭ<EFBFBD>ϲ<EFBFBD><EFBFBD><EFBFBD>
	 *				<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ij<EFBFBD><EFBFBD><EFBFBD><EFBFBD>û<EFBFBD><EFBFBD><EFBFBD>޲ι<EFBFBD><EFBFBD>캯<EFBFBD><EFBFBD><EFBFBD><EFBFBD>û<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ܽ<EFBFBD><EFBFBD>޷<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	 *				<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD>Ĭ<EFBFBD>ϲ<EFBFBD><EFBFBD><EFBFBD>ʱҲ<EFBFBD><EFBFBD><EFBFBD>õ<EFBFBD>
	 * \param name <EFBFBD><EFBFBD><EFBFBD>ƣ<EFBFBD>CreateObject ʱͨ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	 */
	template<typename T, typename ...Args>
	void registerClass(const std::string& name, Args&&... args)
	{
		static_assert(std::is_class<T>::value);

		auto f = [args...]() { return new T(std::forward<Args>(args)...); };
		m_map[name] = f;
	}

	/**
	 * <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	 * 
	 * \param name ǰ<EFBFBD><EFBFBD>ע<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ַ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	 * \return <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ע<EFBFBD>ᣬ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD>룬<EFBFBD><EFBFBD><EFBFBD>򷵻<EFBFBD> nullptr
	 */
	void* createObject(const std::string& name) const
	{
		if (m_map.find(name) != m_map.end())
		{
			return m_map.at(name)();
		}

		return nullptr;
	}

private:
	ClassFactory()
	{
	}

	std::unordered_map<std::string, std::function<void* ()>> m_map;
};