What should I do to subclass fwt::Table, with multi set to true? Any help appreciated.

using fwt

class MyTable: Table {
  // Bool multi := true	// ERROR: Cannot override non-virtual slot

  new make(TableModel tm): super() {
    // multi = true	// ERROR: Cannot set const field
    model = tm
  }
}

class MyTableModel: TableModel {
  new make() {}
  override Int numRows() { 1 }
  override Str text(Int row, Int col) { "foo" }
}

class TableTest {
  Void main() {
    TableModel tm := MyTableModel()
    MyTable myTable := MyTable(tm)
    // ...
  }
}

Um, this must be the same issue discussed in "initialize const field in superclass - how to?" (topic 487). Sorry for duplication, please ignore this.

yeap you got it - hopefully I will start working on it-blocks next week and have a new build out in a week or two

in the meantime, the only practical solution is to to have the guy who constructor MyTable set it, or you can use a factory method on MyTable

How subclassing works with const classes and it-blocks is still not very clean. You don't want to pass an it-block to your parent's constructor if you are going to apply it yourself, because then it would get applied twice:

class A { new make(|This| f) { f(this) } }
class B : A { new make(|This| f) : super(f){ f(this) } }

So there has to be a contract b/w the superclass and subclass for who is in charge of applying the it-block, which in turn requires a contract about how to validate. So we might have to say you shouldn't use a const/it-block styled API if you intend to support subclasses.

For now I changed the compiler to allow a subclass to set its parent's const fields in its own constructor. But I am not going to worry about this particular problem too much right now, I want to get the overall feature rolled out so we can start playing with it.