Scalar + array operations

[John Colvin via Digitalmars-d-learn]

On Wednesday, 21 May 2014 at 11:45:57 UTC, Stefan Frijters wrote:
> When working on my current project (writing a numerical 
> simulation code) I ran into the following issue when trying to 
> multiply a vector (represented by a fixed-length array) by a 
> scalar:
>
> import std.stdio;
>
> void main() {
>   int ifoo = 2;
>   int[3] ibar = 1;
>
>   double dfoo = 2.0;
>   double[3] dbar = 1.0;
>
>   dfoo = ifoo * dfoo;      // Scalar int * scalar double -- OK
>   writeln(dfoo);
>   dfoo = dfoo * dfoo;      // Scalar double * scalar double -- 
> OK
>   writeln(dfoo);
>   dbar = dfoo * dbar[];    // Scalar double * array of double 
> -- OK
>   writeln(dbar);
>   ibar = ifoo * ibar[];    // Scalar int * array of int -- OK
>   writeln(ibar);
>   dbar = ifoo * dbar[];    // Scalar int * array of double -- OK
>   writeln(dbar);
>   // dbar = dfoo * ibar[]; // Scalar double * array of int -- 
> FAIL
>   // writeln(dbar);
> }
>
> I would have expected the last case to work as well, but I get
>
> testarr.d(20): Error: incompatible types for ((dfoo) * 
> (ibar[])): 'double' and 'int[]'
>
> Is this by design? It was very surprising to me, especially 
> since all other combinations do seem to work.
>
> Kind regards,
>
> Stefan Frijters

Please file a bug, there's no reason for that not to work, it 
just needs to be implemented properly.