std::experimental::ranges::IndirectUnaryInvocable, std::experimental::ranges::IndirectRegularUnaryInvocable

From cppreference.com
< cpplrm; | experimentallrm; | ranges
Technical specifications
Filesystem library (filesystem TS)
Library fundamentals (library fundamentals TS)
Library fundamentals 2 (library fundamentals 2 TS)
Extensions for parallelism (parallelism TS)
Extensions for parallelism 2 (parallelism TS v2)
Extensions for concurrency (concurrency TS)
Concepts (concepts TS)
Ranges (ranges TS)
Special mathematical functions (special math TR)
template <class F, class I>

concept bool IndirectUnaryInvocable =
Readable<I> && CopyConstructible<F> &&
Invocable<F&, ranges::value_type_t<I>&> &&
Invocable<F&, ranges::reference_t<I>> &&
Invocable<F&, ranges::iter_common_reference_t<I>> &&
CommonReference<
std::result_of_t<F&(ranges::value_type_t<I>&)>,

std::result_of_t<F&(ranges::reference_t<I>&&)>>;
(ranges TS)
template <class F, class I>

concept bool IndirectRegularUnaryInvocable =
Readable<I> && CopyConstructible<F> &&
RegularInvocable<F&, ranges::value_type_t<I>&> &&
RegularInvocable<F&, ranges::reference_t<I>> &&
RegularInvocable<F&, ranges::iter_common_reference_t<I>> &&
CommonReference<
std::result_of_t<F&(ranges::value_type_t<I>&)>,

std::result_of_t<F&(ranges::reference_t<I>&&)>>;
(ranges TS)