[article] Language Design Deal Breakers

[Walter Bright]

On 5/28/2013 7:40 PM, Jesse Phillips wrote:
> On Monday, 27 May 2013 at 07:53:05 UTC, Walter Bright wrote:
>> In D, right now (and especially with the beta) you can use the NotNull template.
>
> Where is this NotNull template? If it was in Phobos I would expect
> http://dlang.org/phobos/std_typecons.html

It's not in Phobos yet:

struct NotNull(T) {
     T p;

     alias p this;

     this(T p) {
         assert(p != null, "pointer is null");
         this.p = p;
     }

     @disable this();

     NotNull opAssign(T p) {
         assert(p != null, "assigning null to NotNull");
         this.p = p;
         return this;
     }
}