[iterator.iterators]
24 Iterators library [iterators]
24.3 Iterator requirements [iterator.requirements]
24.3.5 C++17 iterator requirements [iterator.cpp17]
24.3.5.2 Cpp17Iterator [iterator.iterators]
The Cpp17Iterator requirements form the basis of the iterator taxonomy; every iterator meets the Cpp17Iterator requirements.
This set of requirements specifies operations for dereferencing and incrementing an iterator.
A type X meets the Cpp17Iterator requirements if
- X meets the Cpp17CopyConstructible, Cpp17CopyAssignable, Cpp17Swappable, and Cpp17Destructible requirements ([utility.arg.requirements], [swappable.requirements]), and
- iterator_traits<X>::difference_type is a signed integer type or void, and
- the expressions in Table 78 are valid and have the indicated semantics.