Re: How can I allocate a int[] array on stack?
On Fri, Mar 26, 2021 at 7:36 AM Daniel Kozak wrote:
> On Fri, Mar 26, 2021 at 7:31 AM Daniel Kozak wrote:
>
>> On Fri, Mar 26, 2021 at 6:50 AM Jack via Digitalmars-d-learn <
>> digitalmars-d-learn@puremagic.com> wrote:
>>
>>> What's the equivalent of C's VLA in D? scoped from std.typecons
>>> doesn't seem to work with arrays. Should I use alloca() for my
>>> array or is there something else?
>>>
>>
>> https://dlang.org/library/std/array/static_array.html
>>
> Sorry I was misread this
>
You can use allocator:
import std.experimental.allocator.showcase;
import std.experimental.allocator;
import std.stdio;
StackFront!4096 stackAlloc;
void main() {
int[] a = stackAlloc.makeArray!int(2);
writeln(a);
}
Re: How can I allocate a int[] array on stack?
On Fri, Mar 26, 2021 at 6:50 AM Jack via Digitalmars-d-learn < digitalmars-d-learn@puremagic.com> wrote: > What's the equivalent of C's VLA in D? scoped from std.typecons > doesn't seem to work with arrays. Should I use alloca() for my > array or is there something else? > https://dlang.org/library/std/array/static_array.html
How can I allocate a int[] array on stack?
What's the equivalent of C's VLA in D? scoped from std.typecons doesn't seem to work with arrays. Should I use alloca() for my array or is there something else?
Re: Contributing CDF bindings to Deimos
On Friday, 26 March 2021 at 00:50:36 UTC, Jordan Wilson wrote: Nice one. I've used HDF5/NetCDF, will have to check out and see what CDF offers. AFAIK CDF is much simpler than NetCDF. If you do generate CDF files and want other common tools to understand your data structures, use the ISTP metadata scheme: https://spdf.gsfc.nasa.gov/istp_guide/istp_guide.html Since deimos.cdf just provides C bindings and type safety, a higher level module would be nicer. Currently, the most natural interface to CDF files that I've used is the spacepy.pycdf python package.
Re: Contributing CDF bindings to Deimos
On Thursday, 25 March 2021 at 04:00:33 UTC, Chris Piker wrote: On Tuesday, 23 March 2021 at 05:54:13 UTC, mw wrote: [...] Okay, that's done. The repo https://github.com/das-developers/deimos.cdf and package https://code.dlang.org/packages/cdf have been drafted and tested on Linux, I'm about to test on Windows and MacOS. As an aside, software developers at NASA Goddard have now heard of D which is nice. They were pleased to see that it was supported by gcc. (Hat tip to the GDC team) I've attempted to follow all guidelines as best I understood them, but this is my first package. It likely has some style and functionality issues. Is there a peer review stage to this process that is triggered automatically or could be requested? Nice one. I've used HDF5/NetCDF, will have to check out and see what CDF offers. Jordan
Re: How to delete dynamic array ?
On Tuesday, 16 March 2021 at 23:49:00 UTC, H. S. Teoh wrote: On Tue, Mar 16, 2021 at 11:28:00PM +, mw via Digitalmars-d-learn wrote: [...] suppose: double[] data; // D type: dynamic array As of 2021 what's the correct way to allocate and deallocate (free memory to the system immediately) D's dynamic array? [...] Note that T[] is just a slice, not the dynamic array itself. The dynamic array is allocated and managed by the GC when you append stuff to it, or when you create a new array with `new` or an array literal. None of the latter, however, precludes you from using T[] for memory that you manage yourself. For example, you could do this: double[] data; data = cast(double[]) malloc(n * double.sizeof)[0 .. n]; correction: this should be: n *= double.sizeof; data = cast(double[])(malloc(n)[0 .. n]); // i.e. slice n == malloc n Now you have a slice to memory you allocated yourself, and you have to manage its lifetime manually. When you're done with it: free(data.ptr); data = []; // null out dangling pointer, just in case The GC does not get involved unless you actually allocate from it. As long as .ptr does not point to GC-managed memory, the GC will not care about it. (Be aware, though, that the ~ and ~= operators may allocate from the GC, so you will have to refrain from using them. @nogc may help in this regard.) T
Re: Contributing CDF bindings to Deimos
On Thursday, 25 March 2021 at 16:57:05 UTC, Bastiaan Veelo wrote: On Thursday, 25 March 2021 at 04:00:33 UTC, Chris Piker wrote: As an aside, software developers at NASA Goddard have now heard of D which is nice. They were pleased to see that it was supported by gcc. (Hat tip to the GDC team) That’s cool. I’d love to see NASA on https://dlang.org/orgs-using-d.html one day. — Bastiaan. I'd like that too, we'll see. The next set of NASA C code that needs bindings is the navigation library at https://naif.jpl.nasa.gov/naif/index.html. This is an older library and so it isn't listed in the expected location https://software.nasa.gov/ A next step for the the CDF bindings would be to parse the existing external text documentation for each function and output ddoc comments. Text processing is not my forte so any hints or volunteers are more than welcome. I'll open an issue for that on github.
Re: What happened to std.net.curl HTTP execute?
On Wednesday, 17 March 2021 at 16:02:58 UTC, tastyminerals wrote:
I am using std.net.curl and the following chunk of code in many
places:
"""
http.setPostData(userData, "application/json");
http.addRequestHeader("Accept", "application/json");
http.addRequestHeader("Authorization", "BEARER " ~
clientAccessToken);
auto jsonData = http.execute.parseJSON;
if (jsonData.isNull) {
"""
Today I tried to compile one of the scripts and it failed with
Error: no property execute for type std.net.curl.HTTP
When was it removed? I checked GitHub history briefly but the
latest change dates back to April 2020 when these scripts were
not even written. How did they work couple of months ago? I am
confused.
Ohh, I created a custom function "execute" which calls
"HTTP.perform" :facepalm:
I need to take a rest.
Re: Contributing CDF bindings to Deimos
On Thursday, 25 March 2021 at 04:00:33 UTC, Chris Piker wrote: As an aside, software developers at NASA Goddard have now heard of D which is nice. They were pleased to see that it was supported by gcc. (Hat tip to the GDC team) That’s cool. I’d love to see NASA on https://dlang.org/orgs-using-d.html one day. — Bastiaan.
Re: Contributing CDF bindings to Deimos
On Thursday, 25 March 2021 at 04:00:33 UTC, Chris Piker wrote: The repo https://github.com/das-developers/deimos.cdf and package https://code.dlang.org/packages/cdf have been drafted and tested on Linux, I'm about to test on Windows and MacOS. As an aside, software developers at NASA Goddard have now heard of D which is nice. They were pleased to see that it was supported by gcc. (Hat tip to the GDC team) Thanks for the contribution. I've attempted to follow all guidelines as best I understood them, but this is my first package. It likely has some style and functionality issues. Is there a peer review stage to this process that is triggered automatically or could be requested? No, D packages is mostly community driven, there is no formal process. The more users use one package, the more feedback one will get, typically logged as github issues, and people communicate on github. You can check some of the most popular packages here: https://code.dlang.org/?sort=score
