Justin Whear:
In addition to the suggestions of Algebraic or Variant
elsewhere in this
thread, it's trivial to implement your own concrete tagged
unions:
struct MyTaggedUnion
{
enum Type { Int, Float, String }
Type tag;
union {
int int_;
float float_;
string string_;
}
}
You can also hide the union members with private and only allow
access
via property getters that check the tag.
See for a bare-bones built-in pattern matching, with an optional
"opMatch" struct method that gets called by the improved switch:
https://d.puremagic.com/issues/show_bug.cgi?id=596
Bye,
bearophile
