Here is a list of all documented namespace members with links to the namespaces they belong to:

### - u -

- u16streampos : std
- u16string : std
- u32streampos : std
- u32string : std
- uncaught_exception() : std
- uncaught_exceptions() : std
- underlying_type_t : std
- unexpected() : std
- unexpected_handler : std
- uninitialized_copy() : std
- uninitialized_copy_n() : __gnu_cxx , std
- uninitialized_fill() : std
- uninitialized_fill_n() : std
- unique() : std
- unique_copy() : std
- unitbuf() : std
- upper_bound() : std
- uppercase() : std
- use_facet() : std