public static LinqExtensionsLookup<TKey, TElement> ToLookup<T, TKey, TElement>(
	this Vector<T> vector,
	Func<T, TKey> keySelector,
	Func<T, TElement> elementSelector,
	IEqualityComparer<TKey> comparer
)

<ExtensionAttribute>
Public Shared Function ToLookup(Of T, TKey, TElement) ( 
	vector As Vector(Of T),
	keySelector As Func(Of T, TKey),
	elementSelector As Func(Of T, TElement),
	comparer As IEqualityComparer(Of TKey)
) As LinqExtensionsLookup(Of TKey, TElement)

public:
[ExtensionAttribute]
generic<typename T, typename TKey, typename TElement>
static LinqExtensionsLookup<TKey, TElement>^ ToLookup(
	Vector<T>^ vector, 
	Func<T, TKey>^ keySelector, 
	Func<T, TElement>^ elementSelector, 
	IEqualityComparer<TKey>^ comparer
)

[<ExtensionAttribute>]
static member ToLookup : 
        vector : Vector<'T> * 
        keySelector : Func<'T, 'TKey> * 
        elementSelector : Func<'T, 'TElement> * 
        comparer : IEqualityComparer<'TKey> -> LinqExtensionsLookup<'TKey, 'TElement>