On Thursday, 27 June 2024 at 18:51:19 UTC, Josh Holtrop wrote:
Questions:
4. Any other general improvements to my solution?
I know it's kind of an unpopular choice these days but one could
go
with inheritance and polymorphism or instanceof tests. something
along the lines of
```d
import std.stdio : writeln;
class Item
{
public void operationA()
{
}
public void operationB()
{
}
}
class ItemA : Item
{
override public void operationA()
{
writeln("ItemA");
}
}
class ItemB : Item
{
override public void operationB()
{
writeln("ItemB");
}
}
void main(string[] args)
{
auto items = [new ItemA(), new ItemB()];
writeln("operation a:");
foreach (item; items)
{
item.operationA();
}
writeln("operation b:");
foreach (item; items)
{
item.operationB();
}
writeln("instance of:");
foreach (item; items)
{
if (auto itemB = cast(ItemB) item)
{
writeln("Found an ItemB");
}
}
}
```
drawback might be, that if you add a new subtype the compiler will
not warn you that you did not implement one case for one of the
implementations.
Kind regards,
Christian
