On 2009-12-17 07:09:57 -0500, KennyTM~ <kenn...@gmail.com> said:
On Dec 17, 09 19:44, Michel Fortin wrote:
On 2009-12-17 01:57:50 -0500, Pelle Månsson <pelle.mans...@gmail.com> said:
On 12/17/2009 01:05 AM, Michel Fortin wrote:
Object? func(Object? o) {
writeln(o.toString());
return o;
}
MyObject o = func(new MyObject);
Here, "Object?" means Object or a derived type.
You know, just Object means Object or a derived type. That's what
inheritance is.
The idea is to be able to say in the function signature that the same
type is returned, avoiding a cast that would be unnecessary otherwise.
It's the same principle as for "const?", or "inout".
But you're right that my definition isn't very good.
T func(T)(T o);
That would work, unless you want a virtual function.
If templates were always an acceptable solution, the whole discussion
about passing const qualifiers from the argument to the return value
wouldn't be of any use either.
--
Michel Fortin
michel.for...@michelf.com
http://michelf.com/
