Mapping with partial

[matovitch via Digitalmars-d-learn]

On Monday, 30 March 2015 at 18:23:32 UTC, Adam D. Ruppe wrote:
> On Monday, 30 March 2015 at 18:07:18 UTC, matovitch wrote:
>> kmeans_example.d(79): Error: template 
>> std.algorithm.iteration.map
>
> That error is easy: use points[].map!(test) instead of 
> points.map.
>
> Since points is a static array, it isn't a range. Static arrays 
> can't be popped through. But if you slice it, then it yields a 
> usable range for map.
>
>
> The other problem though is the partial!(). It expects a 
> template argument for the thing so it can make a new function 
> right there at compile time... which doesn't work with a 
> runtime variable.
>
> The way I'd do it is just with a little hand written delegate. 
> This will compile, for example:
>
>       auto test = (ref Point p) => getRandomPoint(randVar, p);
>       points[].map!(test);
>
>
> and should do what you need.

Nice ! Thanks for the tip ! I tried importing std.range and 
points.array works too.