Probably `range_value_t` may be used here

[SergeyKopienko]

Probably range_value_t may be used here:

oneDPL/include/oneapi/dpl/pstl/utils_ranges.h

Line 65 in 1746d46

using __value_t = decltype(oneapi::dpl::__internal::get_value_type<_R>(0));

Please take a look to https://en.cppreference.com/w/cpp/ranges/range_size_t for details.

[MikeDvorskiy]

I guess - no...
because std::ranges::range_value_t - C++20

[SergeyKopienko]

So we can use it under some define?

[MikeDvorskiy]

yes, under _ONEDPL_CPP20_RANGES_PRESENT probably...