Returns a sequence generated by applying a state to the generator function, and from its result, determines if the sequence should have a next element, its value, and the next state in the recursive call.

Namespace: MoreLinq
Assembly: MoreLinq (in MoreLinq.dll) Version: 3.3.1+b77df70598ab84c28cd43dcf74594024b6d575e1

Syntax

C++

Copy

public static IEnumerable<TResult> Unfold<TState, T, TResult>(
	TState state,
	Func<TState, T> generator,
	Func<T, bool> predicate,
	Func<T, TState> stateSelector,
	Func<T, TResult> resultSelector
)

Public Shared Function Unfold(Of TState, T, TResult) ( 
	state As TState,
	generator As Func(Of TState, T),
	predicate As Func(Of T, Boolean),
	stateSelector As Func(Of T, TState),
	resultSelector As Func(Of T, TResult)
) As IEnumerable(Of TResult)

public:
generic<typename TState, typename T, typename TResult>
static IEnumerable<TResult>^ Unfold(
	TState state, 
	Func<TState, T>^ generator, 
	Func<T, bool>^ predicate, 
	Func<T, TState>^ stateSelector, 
	Func<T, TResult>^ resultSelector
)

static member Unfold : 
        state : 'TState * 
        generator : Func<'TState, 'T> * 
        predicate : Func<'T, bool> * 
        stateSelector : Func<'T, 'TState> * 
        resultSelector : Func<'T, 'TResult> -> IEnumerable<'TResult>

Parameters

state: Type: TState
The initial state.
generator: Type: SystemFuncTState, T
Function that takes a state and computes the next state and the next element of the sequence.
predicate: Type: SystemFuncT, Boolean
Function to determine if the unfolding should continue based the result of the generator function.
stateSelector: Type: SystemFuncT, TState
Function to select the state from the output of the generator function.
resultSelector: Type: SystemFuncT, TResult
Function to select the result from the output of the generator function.

Type Parameters

TState: Type of state elements.
T: Type of the elements generated by the generator function.
TResult: The type of the elements of the result sequence.

Return Value

Type: IEnumerableTResult
A sequence containing the results generated by the resultSelector function.

Remarks

This operator uses deferred execution and streams its results.

Reference

MoreEnumerable Class

MoreLinq Namespace

MoreEnumerableAddLanguageSpecificTextSet("LSTB33431AB_0?cpp=::|nu=.");UnfoldAddLanguageSpecificTextSet("LSTB33431AB_1?cs=&lt;|vb=(Of |cpp=&lt;|fs=&lt;'|nu=(");TState, T, TResultAddLanguageSpecificTextSet("LSTB33431AB_2?cs=&gt;|vb=)|cpp=&gt;|fs=&gt;|nu=)"); Method

Parameters

Type Parameters

Return Value

Reference

MoreEnumerableUnfoldTState, T, TResult Method