bearophile Wrote: > Saaa: > > > Is there a better way to support arrays of any type? > > Currently all the code working with these Structs are templated with loads > > of static ifs in them. > > You have to ask a more precise question if you want an answer. Maybe a more general one :) I use a tagged union scheme to encapsulate different types(arrays) as one type. Accessing the arrays thus always need a type-check, plus I need multiple get/setArray functions (or one template with loads of static ifs). Is there maybe a general scheme which results in the same type support without the all the separate type handling hassle?
> > > Also, is it possible to add a .deepdup property to all arrays? > > D devs don't read posts here, so you have to ask ask in the main newsgroup. I > have asked for that more than a year ago, and I was ignored, as usual. Two might not be a front, at least they make a line. > > Will "a[]=b.dup;" copy b twice? > > When you have questions like this it's good to take a look at the produced > asm. > The dup allocates a new array and then copies data on it. > The a[]=b[]; copies b on a. By 'copies b on a' you mean only the length and pointer, right. How do you produce asm? Not that I can read it but it would be a nice way to start learning it a bit. > > > > int[] array; > > array.length = 100; > > array.length = 0; > > //no other arrays pointing/slicing to this array > > This way I can be sure for the following 100 element concatenations > > the array won't be copied. > > Or isn't this implicitly part of the D spec? > > Are you talking about appends or concatenations? Concatenations produce > memory allocations. But you probably mean 100 appends. Those 100 appends will > not produce allocations or copies. > But generally array appends are slow anyway in D, so where you need to do > them quickly it's much better to use an ArrayBuilder like the one in my > dlibs, of a similar one a bit less efficient in Phobos of D2. Dlibs license doesn't like my commercial project :) (also, deprecated) ByeBye and thanks, Saaa
