These are some other implementations of variant and/or optional types.
They are not necessarily compatible with this implementation. This is an
incomplete list.
- Boost Variant and Boost Optional
- Eggs Variant by Agustín Bergé
- anthonyw/variant (implementation of P0110R0)
- JasonL9000/cppcon14
- tomilov/variant
- akrzemi1/Optional
- mpark/variant