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Showing content from https://en.cppreference.com/w/cpp/language/../numeric/../string/../iterator/sized_sentinel_for.html below:

std::sized_sentinel_for, std::disable_sized_sentinel_for - cppreference.com

1) The sized_sentinel_for concept specifies that an object of the iterator type I and an object of the sentinel type S can be subtracted to compute the distance between them in constant time.

2) The disable_sized_sentinel_for variable template can be used to prevent iterators and sentinels that can be subtracted but do not actually model sized_sentinel_for from satisfying the concept.

A program may specialize

for cv-unqualified non-array object type

and

, as long as at least one of which is a

. Such specializations are usable in

and have type

.

Let i be an iterator of type I, and s a sentinel of type S such that [i, s) denotes a range. Let n be the smallest number of applications of ++i necessary to make bool(i == s) be true. I and S model sized_sentinel_for<S, I> only if all following conditions are satisfied:

• If n is representable by std::iter_difference_t<I>, then s - i is well-defined and equals n.
• If -n is representable by std::iter_difference_t<I>, then i - s is well-defined and equals -n.

Expressions declared in requires expressions of the standard library concepts are required to be equality-preserving (except where stated otherwise).

A requires expression that uses an expression that is non-modifying for some constant lvalue operand also requires implicit expression variations.

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