22 Iterators library [iterators]

22.3 Iterator requirements [iterator.requirements]

22.3.4 Iterator concepts [iterator.concepts]

22.3.4.6 Concept Iterator [iterator.concept.iterator]

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The Iterator concept forms the basis of the iterator concept taxonomy; every iterator models Iterator.
This concept specifies operations for dereferencing and incrementing an iterator.
Most algorithms will require additional operations to compare iterators with sentinels ([iterator.concept.sentinel]), to read ([iterator.concept.input]) or write ([iterator.concept.output]) values, or to provide a richer set of iterator movements ([iterator.concept.forward], [iterator.concept.bidir], [iterator.concept.random.access]).
template<class I>
  concept Iterator =
    requires(I i) {
      { *i } -> can-reference;
    } &&
    WeaklyIncrementable<I>;