Array of BitArrays definition compiles in DMD but not in GDC.

[John Colvin via Digitalmars-d-learn]

On Thursday, 8 October 2015 at 21:40:02 UTC, TheGag96 wrote:
> In my code I'm passing an array of BitArrays to a constructor 
> like this (though mostly as a placeholder):
>
>   Terrain t = new Terrain(1, 15, [
>     BitArray([1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]),
>     BitArray([1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1]),
>     BitArray([0, 0, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1]),
>     BitArray([0, 0, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1]),
>     BitArray([0, 0, 0, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1]),
>     BitArray([1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1]),
>   ]);
>
> The code compiles fine when using DMD 2.068.1 but GDC 5.2.1, I 
> get this error for every line:
>
> error: cannot implicityly convert expression ([stuff]) of type 
> int[] to ulong
>
> Why does this compiler difference exist and how do I get around 
> it? Thanks!

gdc is a bit out of date at the moment. If you do something like 
this:

auto bitArray(bool[] ba) pure nothrow
{
     BitArray tmp;
     tmp.init(ba);
     return tmp;
}

auto bitArray(void[] v, size_t numbits) pure nothrow
{
     BitArray tmp;
     tmp.init(v, numbits);
     return tmp;
}

then replace all your calls to the constructor BitArray with 
bitArray, things should work OK for you.