04.02.2013 20:54, bearophile пишет:
Steven Schveighoffer:
Wow, this is something I didn't know was possible. Very useful!
It's it cute when you use a language almost daily for few years,
and then you see a new way to allocate built-in arrays? :-)
Just a small obvious note that this trick w
On Tue, Feb 05, 2013 at 07:38:40PM +0100, bearophile wrote:
> H. S. Teoh:
>
> >Added to wiki: http://wiki.dlang.org/Dense_multidimensional_arrays
>
> It contains:
>
> enum columns = 100;
> int rows = 100;
> double[gridSize][] gridInfo = new double[columns][](rows);
>
>
> gridSize is undefined.
H. S. Teoh:
Added to wiki:
http://wiki.dlang.org/Dense_multidimensional_arrays
It contains:
enum columns = 100;
int rows = 100;
double[gridSize][] gridInfo = new double[columns][](rows);
gridSize is undefined. I suggest to write something like:
enum nColumns = 100;
int nRows = 120;
double[
On Mon, Feb 04, 2013 at 04:58:36PM +0100, bearophile wrote:
> monarch_dodra:
>
> >If all (but last of) the dimensions are known at compile time,
> >then you can dynamically allocate an array of fixed sized arrays:
> >
> >//
> >enum size_t gridSize = 4_000;
> >enum size_t total = gridSize * g
On Monday, 4 February 2013 at 22:02:48 UTC, bearophile wrote:
monarch_dodra:
Ideally, I wish we could allocate static arrays on the heap
easily:
"int[2]* p = new int[2]()"
To do that I wrap the array inside a static struct:
struct Arr {
int[2] a;
}
Arr* data = new Arr;
writeln(data.a[
See also:
http://d.puremagic.com/issues/show_bug.cgi?id=9265
Bye,
bearophile
monarch_dodra:
Ideally, I wish we could allocate static arrays on the heap
easily:
"int[2]* p = new int[2]()"
To do that I wrap the array inside a static struct:
struct Arr {
int[2] a;
}
Arr* data = new Arr;
writeln(data.a[1]);
Anybody know why this doesn't work?
Maybe it's just a
On Monday, 4 February 2013 at 16:54:37 UTC, bearophile wrote:
Steven Schveighoffer:
Wow, this is something I didn't know was possible. Very
useful!
It's it cute when you use a language almost daily for few years,
and then you see a new way to allocate built-in arrays? :-)
Bye,
bearophile
On 2013-13-04 17:02, Steven Schveighoffer wrote:
BTW, "all (but last of) the dimensions" isn't correct, you know them all
in your example, and it looks great!
I believe his point was that this also works if you don't know the last
dimension beforehand.
--
Simen
Steven Schveighoffer:
Wow, this is something I didn't know was possible. Very useful!
It's it cute when you use a language almost daily for few years,
and then you see a new way to allocate built-in arrays? :-)
Bye,
bearophile
On Mon, 04 Feb 2013 10:58:36 -0500, bearophile
wrote:
monarch_dodra:
If all (but last of) the dimensions are known at compile time, then you
can dynamically allocate an array of fixed sized arrays:
//
enum size_t gridSize = 4_000;
enum size_t total = gridSize * gridSize;
static ass
It's not a big deal, but indexing *might* be a little slower
with this scheme.
Thanks a lot for your reply. It was extremely useful, since I am
optimizing for performance.
monarch_dodra:
If all (but last of) the dimensions are known at compile time,
then you can dynamically allocate an array of fixed sized
arrays:
//
enum size_t gridSize = 4_000;
enum size_t total = gridSize * gridSize;
static assert (total == 16_000_000); //16 million doubles total
stati
On Monday, 4 February 2013 at 15:23:20 UTC, Sparsh Mittal wrote:
I am allocating 2d array as:
double[gridSize][gridSize] gridInfo;
which works for small dimension, but for large dimension, 16Mb
limit comes.
Would you please tell me how do allocate a large 2d array
(which has to be done as a
Thanks for your prompt reply. It was very helpful.
Sparsh Mittal:
I am allocating 2d array as:
double[gridSize][gridSize] gridInfo;
which works for small dimension, but for large dimension, 16Mb
limit comes.
Walter has decided to introduce a very low limit for the size of
static arrays. (Both Clang and G++ support larger ones).
Would yo
I am allocating 2d array as:
double[gridSize][gridSize] gridInfo;
which works for small dimension, but for large dimension, 16Mb
limit comes.
Would you please tell me how do allocate a large 2d array (which
has to be done as a dynamic array)? It is a square grid and
dimensions are already k
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