HelenOS sources

category           65 uspace/lib/cpp/include/__bits/locale/locale.hpp             using category = int;
category          151 uspace/lib/cpp/src/system_error.cpp     const error_category& error_code::category() const noexcept
category          202 uspace/lib/cpp/src/system_error.cpp     const error_category& error_condition::category() const noexcept