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

std::indirect_unary_predicate - cppreference.com

The concept indirect_unary_predicate specifies requirements for algorithms that call unary predicates as their arguments. The key difference between this concept and std::predicate is that it is applied to the type that I references, rather than I itself.

[edit] Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR Applied to Behavior as published Correct behavior P2609R3 C++20 one of the requirements was defined in terms of std::iter_value_t<I>&
which mishandled projections resulting in incompatibility with predicate F& defined in terms of /*indirect-value-t*/<I>
to correctly handle such projections P2997R1 C++20 indirect_unary_predicate required F& to satisfy predicate with
std::iter_common_reference_t<I> does not require

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