23 Ranges library [ranges]

23.8 Range adaptors [range.adaptors]

23.8.8 Split view [range.split]

23.8.8.6 view​::​split [range.split.adaptor]

The name view::split denotes a range adaptor object.
For some subexpressions E and F, the expression view::split(E, F) is expression-equivalent to split_­view{E, F}.