Using reflection to pass and modify a primitive without using array

Question

Working on a imgui port, I've been always used primitive arrays to simulate c++ pointers/addresses pass.

For example:

checkbox("Anti-aliased lines", bool.apply { set(0, style.antiAliasedLines) })
style.antiAliasedLines = bool[0]

where bool: BooleanArray

I just explored the possibility to directly pass the field instead, sort of c++:

ImGui::Checkbox("Anti-aliased lines", &style.AntiAliasedLines);

kotlin:

checkbox("Anti-aliased lines", style::antiAliasedLines })

I just needed to accomodate a corresponding KMutableProperty0<Boolean> on checkbox(), and I also double checked to have the possibility to set that field within the same function: there is a get(): Boolean and a set(Boolean)

My concerns are:

does this play nice with java?
are there any contraindications I should be aware of, if I go down this route? Such as performances or whatever?

Because I got the feeling that since this approach is somehow hacky and dirty

hotkey · Accepted Answer · 2017-11-08 10:21:52Z

2

Does this play nice with java?

One thing that won't work is referencing synthetic properties that Kotlin uses to represent Java getters and setters, e.g. getFoo + setFoo → foo (and you cannot use a bound callable reference bar::foo). This is not supported for now.

You can try to workaround that by a custom KMutableProperty0 implementation that accepts unbound callable references to Bar::getFoo, Bar::setFoo and bar and acts as a property reference in the sense of getting and setting its value.

Are there any contraindications I should be aware of, if I go down this route? Such as performances or whatever?

A bound callable reference holds a reference to the receiver, so style::antiAliasedLines will keep style from GC, and you have to be careful about which callable references you store.

answered Nov 8, 2017 at 10:21

hotkey

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