[iterator.concept.input] (original) (raw)

23 Iterators library [iterators]

23.3 Iterator requirements [iterator.requirements]

23.3.4 Iterator concepts [iterator.concepts]

23.3.4.9 Concept input_­iterator [iterator.concept.input]

The input_­iterator concept defines requirements for a type whose referenced values can be read (from the requirement forindirectly_­readable ([iterator.concept.readable])) and which can be both pre- and post-incremented.

[ Note

:

Unlike the Cpp17InputIterator requirements ([input.iterators]), the input_­iterator concept does not need equality comparison since iterators are typically compared to sentinels.

— end note

]

template concept input_iterator = input_or_output_iterator && indirectly_readable && requires { typename ITER_CONCEPT(I); } && derived_from<ITER_CONCEPT(I), input_iterator_tag>;