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

std::incrementable - cppreference.com

This concept specifies requirements on types that can be incremented with the pre- and post-increment operators, whose increment operations are equality-preserving, and the type is std::equality_comparable.

Unlike with std::weakly_incrementable, which only support single-pass algorithms, multi-pass one-directional algorithms can be used with types that model std::incrementable.

I models std::incrementable only if given any two incrementable objects a and b of type I:

• bool(a == b) implies bool(a++ == b), and
• bool(a == b) implies bool(((void)a++, a) == ++b).

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

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