MyGameFramework/lib/gwen/gwen_userdata.h

#pragma once
#ifndef GWEN_USERDATA_H
#define GWEN_USERDATA_H

namespace Gwen
{
	/*

		Allows you to store multiple and various user data
		
		//
		// Valid
		//
		UserDataStorage.Set( 100.0f );
		UserDataStorage.<float>Get();

		//
		// Invalid - didn't Add a float type!
		//
		UserDataStorage.Set( 100 );
		UserDataStorage.<float>Get();

		//
		// You can pass structs as long as they can be copied safely.
		//
		UserDataStorage.Set( mystruct );
		UserDataStorage.<MyStruct>Get();

		//
		// If you pass a pointer then whatever it's pointing to
		// should be valid for the duration. And it won't be freed.
		//
		UserDataStorage.Set( &mystruct );
		UserDataStorage.<MyStruct*>Get();

	*/
	class UserDataStorage
	{
			struct ValueBase 
			{ 
				virtual void DeleteThis() = 0; 
			};

			template<typename T> struct Value : public ValueBase 
			{ 
				T val; 

				Value( const T& v )
				{ 
					val = v; 
				}
				
				virtual void DeleteThis()
				{
					delete this;
				}				
			};

		public:

			UserDataStorage()
			{
			}

			~UserDataStorage()
			{
				stl::map< Gwen::String, void*>::iterator it = m_List.begin();
				stl::map< Gwen::String, void*>::iterator itEnd = m_List.end();

				while( it != itEnd )
				{
					((ValueBase*)it->second)->DeleteThis();
					++it;
				}
			}

			template<typename T>
			void Set( const Gwen::String& str, const T& var )
			{
				Value<T>* val = NULL;

				stl::map< Gwen::String, void*>::iterator it = m_List.find( str );
				if ( it != m_List.end() )
				{
					((Value<T>*)it->second)->val = var;
				}
				else
				{
					val = new Value<T>( var );
					m_List[ str ] = (void*) val;
				}
				
			};
			
			bool Exists( const Gwen::String& str )
			{
				return m_List.find( str ) != m_List.end();
			};

			template <typename T>
			T& Get( const Gwen::String& str )
			{
				Value<T>* v = (Value<T>*) m_List[ str ];
				return v->val;
			}

			stl::map< Gwen::String, void*>	m_List;
	};

};

#endif