HelenOS sources

common_type       461 uspace/lib/cpp/include/__bits/chrono.hpp         using CR = typename common_type<typename ToDuration::rep, Rep, intmax_t>::type;
common_type      1184 uspace/lib/cpp/include/__bits/type_traits/type_traits.hpp     using common_type_t = typename common_type<T...>::type;
common_type      1187 uspace/lib/cpp/include/__bits/type_traits/type_traits.hpp     struct common_type<T>: common_type<T, T>