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Guthur

C++ Template question

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I have been experimenting with c++ templates recently and I compiled and ran the code below and i was wondering why it even compiled let alone ran, admittedly the returned std::vector was null, but regardless the Grid vector for that type had never been created so why did it not fail. Note: I have left out some unrelated stuff and this code is all very much prototype quality :) I think i should probably declare the friend types explicitly though what i ran
template <typename T>
	class GamePiece : protected CObject< T >
	{	
	public:
		GamePiece() {}
		GamePiece(std::string name, T object) : CObject(name) { if (!IsValid()) CreatePiece( object ); }

		void Searchfor() 
		{ 
			std::vector< std::map<unsigned, Bot> > Bots = TileLayer<Bot, 10,10>::Grid.at(2); 
			int test = 0;
		}

	private:
		void CreatePiece ( T object );
	};




what it should have been
const unsigned TILE_LAYER_ROWS = 10;
const unsigned TILE_LAYER_COLUMNS = 10;
typedef TGE_v01::GamePiece<Bot>				BOT;
typedef TGE_v01::TileLayer<BOT, TILE_LAYER_COLUMNS, TILE_LAYER_ROWS>			BOT_LAYER;

template <typename T>
	class GamePiece : protected CObject< T >
	{	
	public:
		GamePiece() {}
		GamePiece(std::string name, T object) : CObject(name) { if (!IsValid()) CreatePiece( object ); }

		void Searchfor() 
		{ 
			std::vector< std::map<unsigned, BOT> > Bots = BOT_LAYER::Grid.at(2); 
			int test = 0;
		}

	private:
		void CreatePiece ( T object );
	};




TileLayer template
template <typename WorldObject, unsigned colCount, unsigned rowCount>
	class TileLayer
	{
	public:
		template<typename Other> friend class GamePiece;
		TileLayer ();
		~TileLayer ( void );

		....

		static std::vector< std::vector< std::map<unsigned, WorldObject> > > Grid;
	private:
		unsigned ColumnCount, RowCount;

	};




Sorry there is so much :) Edit: Removed some unnecessary code Doh Title :s

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