On Wed, 02 Sep 2009 16:54:30 -0400, Andrei Alexandrescu
<seewebsiteforem...@erdani.org> wrote:
grauzone wrote:
Andrei Alexandrescu wrote:
I plan to add a Nullable struct to Phobos (akin to C#'s Nullable,
Boost's Optional).
Apparently a good design is to define Optional!T with a minimum of
member functions (ideally none) and have it use the "alias this"
feature to masquerade as a T. That way Optional!T looks and feels much
like a T, except that it supports a function
I still don't understand how one can feel comfortable with the fact,
that "alias this" can overshadow arbitrary members of the alias'ed type.
That's why I want to add no member functions to Optional. The test for
null will be a free function.
How does Optional!valuetype support this:
Optional!valuetype x;
x = null;
Don't you need opAssign?
-Steve
