phobos dependencies

[Andrei Alexandrescu]

On 12/20/13 5:45 AM, Joseph Rushton Wakeling wrote:
> On 20/12/13 10:06, Meta wrote:
>      void topN(alias less = "a < b",
>              SwapStrategy ss = SwapStrategy.unstable,
>              Range, RandomGen)(Range r, size_t nth, ref RandomGen rng)
>          if (isRandomAccessRange!(Range) && hasLength!Range
>              && isUniformRNG!RandomGen)  // <--- needs
> std.random.isUniformRNG
>      {
>          static assert(ss == SwapStrategy.unstable,
>                  "Stable topN not yet implemented");
>          while (r.length > nth)
>          {
>              auto pivot = uniform(0, r.length, rng);
>              // ... etc. ...
>          }
>      }

I had this idea fot a while, and Walter is favorable of it as well - 
extend "import" for one-shot use. With that feature the example would 
become:

     void topN(alias less = "a < b",
             SwapStrategy ss = SwapStrategy.unstable,
             Range, RandomGen)(Range r, size_t nth, ref RandomGen rng)
         if (isRandomAccessRange!(Range) && hasLength!Range
             && import.std.random.isUniformRNG!RandomGen)
     { ... }

In this case "import" would syntactically be placed at the beginning of 
a qualified name, meaning "import this module lazily and look up the 
symbol in it".

This would simplify quite a lot of two-liners into one-liners in other 
places, too.


Andrei