ChainIterator

ChainIterator: ChainIterator, hasValue, value, increment, chain, map, filter, print, toList, sum

struct ChainIterator<Element, First, Second>: Iterator<Element&>, Printable

Lazily concatenates two iterators: yields all of the first's elements, then all of the second's. Get one from chain(); collect with toList().

ChainIterator(First first, Second second)

Initializes an iterator yielding first's elements, then second's.

bool hasValue()

Returns true if either iterator has more elements.

Element& value()

Returns the next element.

void increment()

Advances to the next element.

ChainIterator<Element, ChainIterator<Element, First, Second>, Other> chain<Other>(Other other)

Lazily appends another iterator's elements.

MappedIterator<Output, Element, ChainIterator<Element, First, Second>, Pred> map<Output, Pred: Output(Element&)>(Pred transform)

Lazily transforms the elements.

MappedIterator<Output, Element, ChainIterator<Element, First, Second>, Pred> map<Output, T: Copyable, Pred: Output(T)>(Pred transform)

Lazily transforms the elements.

FilterIterator<Element, ChainIterator<Element, First, Second>, Pred> filter<Pred: bool(Element&)>(Pred include)

Lazily keeps the elements satisfying the predicate.

FilterIterator<Element, ChainIterator<Element, First, Second>, Pred> filter<T: Copyable, Pred: bool(T)>(Pred include)

Lazily keeps the elements satisfying the predicate.

void print(OutputStream& stream)

Prints the remaining values in list form, e.g. [1, 2, 3].

List<Element> toList()

Collects the remaining elements into a list by copying them; only sound for Copyable elements.

Element sum()

Returns the sum of the remaining elements, or zero if there are none.