Does this already exist in the stdlib? And if not...

# stdlib

[Rob Elliot]

Does this already exist in the stdlib?

And if not, why is it a dreadful idea? 😃

(I find that most of the time when I use PropertyDelegateProvider it's just to capture the name of the property)

Untitled.kt

[Rob Elliot]

This is an example use case - just want to pass the property name to an arbitrary function to avoid the repetition.

Untitled.kt

[Youssef Shoaib [MOD]]

I'm pretty sure Map already provides a getValue that does exactly that btw. But yes you can do that

[Rob Elliot]

So it does, that's cool. (Map access wasn't actually my use case, just wanted to show an easily understandable example.)

[Youssef Shoaib [MOD]]

I think it's likely better to just define the operator for your class, but this is fine too.
I would also suggest, instead of using ReadOnlyProperty, to instead do something like:

@JvmInline value class Wrapper<T>(val value: T)
inline operator fun <T> Wrapper<T>.getValue(...): T = value

[Rob Elliot]

I'm not totally following, I confess. In my use case there isn't a class to add it to, I don't think.

[Youssef Shoaib [MOD]]

Instead of returning a ReadOnlyProperty you can just return a Wrapper is what I'm saying. It's a little bit of reduced wrapping, that's all

[Rob Elliot]

Like this?

Untitled.kt

[Rob Elliot]

Bit ugly that I have to import getValue as well as passPropertyNameTo - but I guess that's the price of the inlining... I think I'll take the hit of the extra object allocations and go with this:

Untitled.cpp

[Youssef Shoaib [MOD]]

You could probably just make the extension a member instead and that's it