SumType is a generic sum type for modern D. It is meant as an
alternative to `std.variant.Algebraic`.
Features:
- Pattern matching, including support for structural matching
(★)
- Self-referential types, using `This`
- Works with pure, @safe, @nogc, and immutable (★)
- Zero runtime overhead compared to hand-written C
- No heap allocation
- Does not rely on runtime type information (`TypeInfo`) (★)
Starred features (★) are those that are missing from `Algebraic`.
Code examples are available in the documentation (linked below).
New since the last announced version, 0.5.3:
- SumType is now 100% @safe!
- `match` now considers all overloads of functions passed as
handlers.
- Several bugs affecting const and immutable SumTypes have been
fixed.
- Comparison of SumTypes with the `==` operator now correctly
forwards
to the contained type's `==` operator.
- A couple of confusing error messages have been improved.
- Test builds on Travis CI now use both LDC and DMD.
Many thanks to Atila Neves for his contributions to this release.
In particular, the changes to `match` and the `==` operator are
the result of his efforts. It's been a pleasure working with him,
and I hope to have more opportunities to do so.
Links:
- Documentation: https://pbackus.github.io/sumtype/sumtype.html
- DUB: https://sumtype.dub.pm
- Github: https://github.com/pbackus/sumtype
