This will be C++ std::expected: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0323r3.pdf http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p03

This will be C++ std::expected: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0323r3.pdf http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p032... Returns a value (as in std::optional) than can be null. If so you will get an error explaining what happened.