1. e61fba3 Add all the relational operators to std::experimental::optional. Also update bad_optional_access to match the Library Fundamentals draft standard. This is not all of the upcoming changes to optional, though. by Marshall Clow · 11 years ago[Copied (65%) from libcxx/test/utilities/optional/optional.nullops/eqaul.pass.cpp]
  2. c8528b5 Whitespace maintenance. Remove a bunch of tabs that snuck in. No functionality change by Marshall Clow · 11 years ago
  3. dfdac03 Move <optional> into include/experimental, and into the std::experimental namespace, since it's not part of C++14, but of an upcoming TS by Marshall Clow · 12 years ago
  4. e7d746d Implement N3672, optional<T>. by Howard Hinnant · 12 years ago