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Showing content from https://en.cppreference.com/w/cpp/algorithm/../ranges/../experimental/ranges/iterator/Sentinel.html below:

std::experimental::ranges::Sentinel - cppreference.com

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).

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