Error on recursive alias

[Johan Mollevik]

Johan Mollevik wrote:

> bearophile wrote:
> 
>> Johan Mollevik:
>> 
>>> x and y are the two dimensional indices into the 4x4 array
>>> block and v
>>> is the vallue at block[y][x]
>> 
>> OK. Something like this?
>> 
>> 
>> import std.stdio, std.typecons;
>> 
>> struct NaturalScan(T) {
>>      T[][] data;
>>      size_t r, c;
>> 
>>      @property bool empty() const pure nothrow {
>>          return r == data.length;
>>      }
>> 
>>      @property Tuple!(size_t, size_t, T) front()
>>      const pure nothrow {
>>          return typeof(return)(r, c, data[r][c]);
>>      }
>> 
>>      void popFront() pure nothrow {
>>          c = (c + 1) % data[r].length;
>>          if (c == 0)
>>              r++;
>>      }
>> }
>> 
>> NaturalScan!T naturalScan(T)(T[][] m) {
>>      return typeof(return)(m);
>> }
>> 
>> void main() {
>>      auto mat = [[10, 20], [30, 40, 50], [60, 70]];
>>      foreach (r, c, v; mat.naturalScan)
>>          writefln("%d %d %d", r, c, v);
>> }
>> 
>> 
>> Bye,
>> bearophile
> 
> That looks like it might work for 2 dimensions and as that is the use
> case I have right now I might settle for that. (and I can add more
> overloads manually if needed)
> 
> The original code was genereal enough to handle any number of
> dimensions thou.
> 
> Bassically this would work like this
> 
> uint[][][] array=...
> 
> foreach(x,v;opApplyN(array)){//using only one index (x)
> //v has type uint[][]
> }
> 
> 
> foreach(x,y,v;opApplyN(array)){//using two indeces (x,y)
> //v has type uint[]
> }
> 
> 
> foreach(x,y,z,v;opApplyN(array)){//using three index (x,y,z)
> //v has type uint
> }
> 
> So if someone know anything of why I get the error on recursive 
aliases
> I might try to get that working again otherwise I might try your code
> as it is enough for now
> 
> Thnks for the help by the way

Hmm, your solution does not work with static arrays it seems, will se 
if I can sort that out