std::experimental::ranges::Sentinel
From cppreference.com
< cpp | experimental | ranges
| Defined in header <experimental/ranges/iterator>
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| template< class S, class I > concept bool Sentinel = |
(ranges TS) | |
The Sentinel concept specifies the relationship between an Iterator type and a Semiregular type whose values denote a range.
Let s and i be values of type S and I, respectively, such that [i, s) denotes a range. Sentinel<S, I> is satisfied only if:
- i == s is well-defined.
- If bool(i != s) then
iis dereferenceable and[++i,s)denotes a range.
The domain of == can change over time. Given an iterator i and sentinel s such that [i, s) denotes a range and i != s, [i, s) is not required to continue to denote a range after incrementing any iterator equal to i (and so i == s is no longer required to be well-defined after such an increment).