Package libexpected-devel: Information

Header-only Development files for expected.

std::expected is proposed as the preferred way to represent objec
which will either have an expected value, or an unexpected value
giving information about why something failed. Unfortunately,
chaining together many computations which may fail can be verbose,
as error-checking code will be mixed in with the actual programming
logic. This implementation provides a number of utilities to make
coding with expected cleaner.