Add support for equality operators via new 'requires' keyword for interfaces

[AndrewAtAvenza]

This is the proof-of-concept for adding the new interface keyword requires(). While this keyword will currently accept both eq and ord, it only generates code for eq. Also, it currently only works for Java -> C++ (not even the reverse).

Currently, eq means defining both 'equals()andhashCode()in Java and directing them tooperator==(const & other) constandint32_t hashCode() const` respectively. The former should be fine, but the latter could clash with a user-defined method name. Maybe this is an acceptable trade-off though?

[a4z]

you should be able to fix the formatCheck CI by running sbt scalafmtAll
see https://djinni.xlcpp.dev/djinni-generator/developer-guide/#code-formatting

if that stopped working, please let me know

[AndrewAtAvenza]

you should be able to fix the formatCheck CI by running sbt scalafmtAll see https://djinni.xlcpp.dev/djinni-generator/developer-guide/#code-formatting

if that stopped working, please let me know

Much obliged! I took a look at that on Monday but thought I had to install it and could figure out how to do that. Glad it's just there, that's really handy.

Sorry it's been quiet the last couple of days. I'm landing some big branches and blocking a release. Should be back to this tomorrow or Friday. I took a quick look at how it might look publishing Java to C++ and I've got some thoughts I'll post to the discussion thread later.

[a4z]

Sorry it's been quiet the last couple of days. I'm landing some big branches and blocking a release. Should be back to this tomorrow or Friday. I took a quick look at how it might look publishing Java to C++ and I've got some thoughts I'll post to the discussion thread later.

No worries, take your time. This an OS project, so contributing shall also make fun. No stress