std.experimental.randomized_unittest_benchmark is ready for comments

[Jack Stouffer via Digitalmars-d]

On Sunday, 19 June 2016 at 19:03:55 UTC, Robert burner Schadek 
wrote:
> On Sunday, 19 June 2016 at 18:51:09 UTC, Jack Stouffer wrote:
>> I would like to try this out on my date parsing library, but I 
>> don't see a way to generate strings of a specific format.
>
> take a look at 
> https://github.com/dlang/phobos/pull/2995/files#diff-1a5f159e09980950bb9931ac674cbf40R358
>
> just create a new Gen struct that generates what you want and 
> make it a parameter to a function. And you should be done.

Hmm, isGen is failing for some reason, and I can't tell why

struct GenDateString
{
     import std.format : formattedWrite;
     import std.random : Random, uniform;
     import std.array : appender;

     string value;

     void gen(ref Random gen)
     {
         auto app = appender!string();

         app.formattedWrite(
             "%s-%s-%s",
             uniform!("[]")(1, 3000),
             uniform!("[]")(1, 12),
             uniform!("[]")(1, 28)
         );

         this.value = app.data;
     }

     ref string opCall()
     {
         return this.value;
     }

     alias opCall this;
}