std::experimental::ranges::Sentinel - cppreference.com (original) (raw)

| | | | | -------------------------------------------------------------------------------------------------------------------------------- | | ----------- | | template< class S, class I > concept bool Sentinel = Semiregular<S> && Iterator<I> && WeaklyEqualityComparableWith<S, I>; | | (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 i is 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).