Create a field `cols` with an `operator fun set` a...

# getting-started

[karelpeeters]

Create a field cols with an operator fun set and you can do M.cols[3] = v.

[Hullaballoonatic]

I have a cols field which returns a list of the column vectors

[Hullaballoonatic]

i've never thought it possible to write operator overload functions for individual fields

[Hullaballoonatic]

that's possible?

[Hullaballoonatic]

I thought a fields set operator had to have a parameter of the precise type as the type of the field's declaration

[karelpeeters]

No you can't, you need an extra class and instance for this.

[Hullaballoonatic]

i figured

[Hullaballoonatic]

so i'd need to create a Rows class and a Cols class, essentially

[karelpeeters]

Yes.

[Hullaballoonatic]

alright, doable

[karelpeeters]

I'm not sure which one the JVM is best at inlining away, a permanent field or a new instance returned every time from the cols getter.

[karelpeeters]

Something to benchmark.

[Hullaballoonatic]

yeah, you either have to add stuff to constantly update the permanent field or it's expensive to access it every time

[karelpeeters]

You don't need to update anything.

[Hullaballoonatic]

i can use an inner class

[Hullaballoonatic]

it'll just store pointers basically

[karelpeeters]

Yes.