I am pleased to announce that Outcome v2, rewritten to fulfil the Boost peer review feedback from two months ago, has reached feature completeness. Outcome provides a STL-quality `result<T, EC>` and an `outcome<T, EC, E>` implementation of success|failure value transports, and is expected to pass a second Boost peer review and be submitted for C++ standardisation as the lowest level of an overall framework as proposed by: * http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0650r0.pdf C++ Monadic interface * http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0323r2.pdf A proposal to add a utility class to represent expected object (Revision 4) The idea is that result/outcome are the extremely lightweight struct-like success|failure value transports suitable for usage in public APIs, whereas expected is the much richer variant-like monadic success|failure value transports, and everything participates together under P0650R0. A detailed changelog over v1 can be found at https://github.com/ned14/outcome/blob/master/Readme.md. The main changes are the removal of lots of stuff which was in v1, and we now replicate `std::variant<...>` constructor API. v2 is an “absolute bare minimum” implementation with no frills. Outcome v2 is passing the modified v1 test suite handily, and v1 code should port to v2 easily enough. But as an all-new codebase it lacks: * Maturity * Polish * Use experience * Documentation (a class synopsis can be found at https://ned14.github.io/outcome/synopsis/) My hope is to return Outcome v2 for Boost peer review by October. If you are using an internal Expected-like object, or Outcome v1, I’d hugely appreciate it if you tried porting your code to using v2 and giving me feedback on how it went for you. Minimum compilers needed are GCC 6 or clang 4. Help with documentation and testing is also hugely appreciated. My thanks in advance! Github: https://github.com/ned14/outcome Docs (highly incomplete): https://ned14.github.io/outcome/ Niall -- ned Productions Limited Consulting http://www.nedproductions.biz/ http://ie.linkedin.com/in/nialldouglas/