On Wed, Feb 20, 2013, at 08:29 AM, JM wrote:
>
> There is no such but you can write that interface:
>
> For example:
>
> public interface IStringable {
> public string get_string();
> }
>
I guess I could write the interface, but what I want to be able to do
is, e.g., simply create a type by passing an int to the generic, then
have the class be able to see if it's type (int in this example). has a
to_string() method. For example:
public interface IStringable {
public abstract string to_string();
}
public class StringableClass : IStringable, Object {
public string to_string() {
return "foo";
}
}
public class NotStringableClass : Object {
}
public class Printer<T> {
T obj;
public Printer(T val) {
obj = val;
}
public void print() {
if (obj is IStringable) {
stdout.printf("%s\n", ((IStringable) obj).to_string());
} else {
stdout.printf("Not printable.\n");
}
}
}
void main() {
var i = 10;
var yes = new StringableClass();
var not = new NotStringableClass();
var i_p = new Printer<int>(i);
var yes_p = new Printer<StringableClass>(yes);
var not_p = new Printer<NotStringableClass>(not);
yes_p.print();
not_p.print();
stdout.print("%s\n", i.to_string());
i_p.print();
}
valac compiles this fine, but when it gets to i_p.print() it segfaults.
What I want to be able to do is say "yes, I see that int has a
to_string() method" and call it.
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