Dynamic multidimensional arrays

[Jonathan M Davis]

On 2011-07-04 23:56, Jonathan M Davis wrote:
> On 2011-07-04 23:42, Bellum wrote:
> > Can anyone point me in the right direction for doing something like this
> > 
> > in D:
> >      char[][] anArray;
> >      int rows, cols;
> >      
> >      ...
> >      
> >      anArray = new char[rows][cols];
> > 
> > It isn't possible in this way because "rows cannot be read at compile
> > time", which seems to me to be the point of dynamic arrays. :P
> 
> auto anArray = new char[][](rows, cols);
> 
> Putting the numbers directly in the brackets tries to create a static array
> once you get beyond the first dimension. So,
> 
> auto anArary = new char[4][5];
> 
> would create a dynamic array of length for with elements which are static
> arrays of length 5. If you want it to by dynamic all the way, you need to
> put the dimensions in the parens like above. Personally, I _never_ put
> them in the brackets, even when the dynamic array has just one dimension.
> It's just simpler to always put them in the parens and not worry about it.

Correction,

auto anArray = new char[4][5];

would create a dynamic array of length 5 of static arrays with length 4, 
though

auto anArray = new char[][](4, 5);

does create a dynamic array of length 4 of dynamic arrays of length 5. It 
quickly gets confusing when dealing with dimensions and static arrays IMHO.

- Jonathan M Davis