Inherits from RACSequence : RACStream : NSObject
Declared in RACDynamicSequence.h
RACDynamicSequence.m

Overview

Private class that implements a sequence dynamically using blocks.

Tasks

Other Methods

Other Methods

Class Methods

sequenceWithHeadBlock:tailBlock:

Creates a sequence that dynamically generates its values.

+ (RACSequence *)sequenceWithHeadBlock:(id ( ^ ) ( void ))headBlock tailBlock:(RACSequence *( ^ ) ( void ))tailBlock

Discussion

headBlock - Invoked the first time head is accessed. tailBlock - Invoked the first time tail is accessed.

The results from each block are memoized, so each block will be invoked at most once, no matter how many times the head and tail properties of the sequence are accessed.

Any side effects in headBlock or tailBlock should be thread-safe, since the sequence may be evaluated at any time from any thread. Not only that, but tail may be accessed before head, or both may be accessed simultaneously. As noted above, side effects will only be triggered the first time head or tail is invoked.

Returns a sequence that lazily invokes the given blocks to provide head and tail. headBlock must not be nil.

Declared In

RACSequence.h

sequenceWithLazyDependency:headBlock:tailBlock:

Returns a sequence which evaluates dependencyBlock only once, the first time either headBlock or tailBlock is evaluated. The result of dependencyBlock will be passed into headBlock and tailBlock when invoked.

+ (RACSequence *)sequenceWithLazyDependency:(id ( ^ ) ( void ))dependencyBlock headBlock:(id ( ^ ) ( id dependency ))headBlock tailBlock:(RACSequence *( ^ ) ( id dependency ))tailBlock

Declared In

RACDynamicSequence.h

Instance Methods

head

The first object in the sequence, or nil if the sequence is empty.

- (id)head

Discussion

Subclasses must provide an implementation of this method.

Declared In

RACSequence.h

tail

All but the first object in the sequence, or nil if the sequence is empty.

- (RACSequence *)tail

Discussion

Subclasses must provide an implementation of this method.

Declared In

RACSequence.h