std::experimental::ranges::OutputIterator

C++

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Technical Specifications

Technical specifications

Filesystem library (filesystem TS)

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Library fundamentals 2 (library fundamentals 2 TS)

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Iterator concepts
Readable Writable WeaklyIncrementable Incrementable	Iterator Sentinel SizedSentinel	InputIterator ForwardIterator BidirectionalIterator RandomAccessIterator	OutputIterator
Indirect callable concepts
IndirectUnaryInvocableIndirectRegularUnaryInvocable	IndirectUnaryPredicate	IndirectRelation	IndirectStrictWeakOrder
Common algorithm requirements
IndirectlyMovable IndirectlyMovableStorable	IndirectlyCopyable IndirectlyCopyableStorable	IndirectlySwappable IndirectlyComparable	Permutable Mergeable Sortable
Concept utilities
indirect_result_of	projected
Iterator utilities and operations
iter_move iter_swap	advance distance	next prev
Iterator traits
difference_type value_type reference_t rvalue_reference_t iter_common_reference_t iterator_category	input_iterator_tagoutput_iterator_tagforward_iterator_tagbidirectional_iterator_tagrandom_access_iterator_tag	ranges::iterator_traits std::iterator_traits<InputIterator>std::iterator_traits<OutputIterator>
Iterator adaptors
reverse_iterator move_iterator move_sentinel	back_insert_iterator front_insert_iterator insert_iterator	common_iterator counted_iterator default_sentinel	danglingsafe_iterator_t unreachable
Stream iterators
istream_iterator	ostream_iterator	istreambuf_iterator	ostreambuf_iterator

Defined in header <experimental/ranges/iterator>
template <class I, class T> concept bool OutputIterator = Iterator<I> && Writable<I, T> && requires(I i, T&& t) { *i++ = std::forward<T>(t); // not required to be equality preserving };		(ranges TS)

The OutputIterator concept is a refinement of Iterator, adding the requirement that it can be used to write values of values of type and value category encoded by T (via Writable). EqualityComparable is not required.

Let E be an expression such that decltype((E)) is T, and i be a dereferenceable object of type I. OutputIterator<I, T> is satisfied only if *i++ = E; has effects equivalent to *i = E; ++i;.

Equality preservation

An expression is equality preserving if it results in equal outputs given equal inputs.

• The inputs to an expression consist of its operands.
• The outputs of an expression consist of its result and all operands modified by the expression (if any).

Every expression required to be equality preserving is further required to be stable: two evaluations of such an expression with the same input objects must have equal outputs absent any explicit intervening modification of those input objects.

Notes

Unlike the output iterator requirements in the C++ standard, OutputIterator in the Ranges TS does not require that the iterator category tag be defined.

Algorithms on output iterators should be single pass.