https://learncplusplus.org/what-is-decltype-auto-in-modern-c-and-how-to-use-it/
What Is Decltype (auto) In Modern C++ And How To Use It?
Oct 5, 2023 - The auto keyword arrives with the new features of the C++11 and the standards above. In C++14, there is a new decltype that is used with auto keyword. In...
how to usewhat isdecltypeautomodern
https://unicode-org.github.io/icu-docs/apidoc/released/icu4c/structU__HEADER__ONLY__NAMESPACE_1_1prv_1_1range__type_3_01Range_00_01std_1_1void__t_3_01decltypf5078535dbcf2fa34be202d612eb2ece.html
ICU 78.3: U_HEADER_ONLY_NAMESPACE::prv::range_type Range, std::void_t decltype(std::declval...
icuheadernamespaceprvrange