public T Opt<T>(
	string key,
	T defValue
)

Public Function Opt(Of T) ( 
	key As String,
	defValue As T
) As T

public:
generic<typename T>
T Opt(
	String^ key, 
	T defValue
)

member Opt : 
        key : string * 
        defValue : 'T -> 'T