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===Semantic requirements===
{{tt|I}} models {{tt|std::incrementable}} only if given any two incrementable objects {{tt|a}} and {{tt|b}} of type {{tt|I}}:
* {{c|1=bool(a == b)}} implies {{c|1=bool(a++ == b)}}, and
* {{c|1=bool(a == b)}} implies {{c|1=bool(((void)a++, a) == ++b)}}.

{{cpp/concepts/equality preservation}}

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