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

### - o -

- oct() : std
- ofstream : std
- operator!=() : __gnu_cxx , std::chrono , std , std::rel_ops , std::tr2
- operator""h() : std::literals::chrono_literals
- operator""min() : std::literals::chrono_literals
- operator""ms() : std::literals::chrono_literals
- operator""ns() : std::literals::chrono_literals
- operator""s() : std::literals::chrono_literals
- operator""us() : std::literals::chrono_literals
- operator%() : std::chrono
- operator&() : std , std::regex_constants , std::tr2
- operator&=() : std::regex_constants
- operator*() : std::chrono , std
- operator+() : __gnu_cxx , std::chrono , std
- operator-() : std::chrono , std , std::tr2
- operator/() : std::chrono , std
- operator<() : __gnu_cxx , std::chrono , std
- operator<<() : std::__detail , std , std::tr2
- operator<=() : __gnu_cxx , std::__debug , std::chrono , std , std::rel_ops , std::tr2
- operator==() : __gnu_cxx , std
- operator>() : __gnu_cxx , std::__debug , std::chrono , std , std::rel_ops , std::tr2
- operator>=() : __gnu_cxx , std::__debug , std::chrono , std , std::rel_ops , std::tr2
- operator>>() : std::__detail , std , std::tr2
- operator^() : std , std::regex_constants , std::tr2
- operator^=() : std::regex_constants
- operator|() : std , std::regex_constants , std::tr2
- operator|=() : std::regex_constants
- operator~() : std::regex_constants
- optimize : std::regex_constants
- ostream : std
- ostringstream : std