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March 02, 2013
[Issue 9637] New: std.typecons.nullable and nullableRef functions
http://d.puremagic.com/issues/show_bug.cgi?id=9637

          Summary: std.typecons.nullable and nullableRef functions
          Product: D
          Version: D2
         Platform: All
       OS/Version: All
           Status: NEW
         Severity: enhancement
         Priority: P2
        Component: Phobos
       AssignedTo: nobody@puremagic.com
       ReportedBy: bearophile_hugs@eml.cc


--- Comment #0 from bearophile_hugs@eml.cc 2013-03-02 13:37:47 PST ---
Spinoff of Issue 9265

I suggest to add to std.typecons two small functions that help the creation of
a Nullable and NullableRef:


import std.typecons;
void main() {
   int x;
   auto n1 = Nullable!int(x);
   auto n2 = NullableRef!int(&x);
   auto n3 = nullable(x); // missing
   auto n4 = nullableRef(&x); // missing
}


This gets handy when the type of the item is complex:

auto n = nullable(data);

Instead of:

auto n = Nullable!(immutable int[4])(data);

- - - - - - - - - - - -

Note: maybe it's possible to support Nullable(T, T nullValue) like this:

auto n5 = nullable!(int.max)(x);

But maybe for simplicity it's better to not support this.

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