24 Iterators library [iterators]

24.4 Iterator primitives [iterator.primitives]

24.4.4 Range iterator operations [range.iter.ops]

24.4.4.1 General [range.iter.ops.general]

1
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The library includes the function templates ranges​::​advance, ranges​::​distance, ranges​::​next, and ranges​::​prev to manipulate iterators.
These operations adapt to the set of operators provided by each iterator category to provide the most efficient implementation possible for a concrete iterator type.
[Example 1: 
ranges​::​advance uses the + operator to move a random_access_iterator forward n steps in constant time.
For an iterator type that does not model random_access_iterator, ranges​::​advance instead performs n individual increments with the ++ operator.
— end example]
2
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The entities defined in [range.iter.ops] are algorithm function objects ([alg.func.obj]).