[Issue 7145] Implement initializedArray in std.array

https://issues.dlang.org/show_bug.cgi?id=7145 Andrej Mitrovic changed: What|Removed |Added Status|NEW |RESOLVED

Re: initializedArray

On 12/21/11, Philippe Sigaud philippe.sig...@gmail.com wrote: size_t[] arrayLengths(A)(A a) if (isStaticArray!A) { static if (isStaticArray!(ElementType!A)) return arrayLengths(a[0]) ~ a.length; else return [a.length]; } That returns an array, but I can't pass an

Re: initializedArray

Ok just realized I can't use a mixin, lengths are dynamic, heheh. That went over my head. I'll see what else I can do.. On 12/21/11, Andrej Mitrovic andrej.mitrov...@gmail.com wrote: On 12/21/11, Philippe Sigaud philippe.sig...@gmail.com wrote: size_t[] arrayLengths(A)(A a) if (isStaticArray!A)

initializedArray

I think it would be cool to have an initializedArray function, which creates and initializes an array with a *specific* initializer. A hardcoded example would be: import std.array; auto initializedArray(F:float[])(size_t size, float init) { auto arr = uninitializedArray!(float[])(size

Re: initializedArray

Ok here's an initial implementation (I've had to put the initializer first, otherwise I can't use variadic arguments): http://www.ideone.com/2rqFb I've borrowed BaseElementType from Philippe Sigaud's template book.

Re: initializedArray

afternote: I didn't actually need to pass that array via ref, I'm only modifying the elements.

Re: initializedArray

Fish, and between Fish and and, and and and And, and And and and, and and and And, and And and and, and and and Chips, as well as after Chips? — Martin Gardner On Tuesday, 20 December 2011 at 12:55:18 UTC, Andrej Mitrovic wrote: I think it would be cool to have an initializedArray function

Re: initializedArray

I would go even further, and give a *function* as an argument - function that will be used to initialise values.

Re: initializedArray

On Tue, Dec 20, 2011 at 14:22, Andrej Mitrovic andrej.mitrov...@gmail.com wrote: Ok here's an initial implementation (I've had to put the initializer first, otherwise I can't use variadic arguments): Why? That works for me: auto initializedArray(T, I...)(I args) if (allSatisfy!(isIntegral

Re: initializedArray

On 12/20/11, Dejan Lekic dejan.le...@gmail.com wrote: I would go even further, and give a *function* as an argument - function that will be used to initialise values. Well I don't know about functions yet, but I did need to use another array as an initializer. So the new implementation takes

Re: initializedArray

*Also those two templates can be merged, I just have to change the constraints.

Re: initializedArray

On 12/20/11, Philippe Sigaud philippe.sig...@gmail.com wrote: Why? I didn't think of using tuples first, initially I've tried using size_t[]... but that was a bad idea. But I still think it should be the first argument, because it's more consistent with regards to array dimensions. You never

Re: initializedArray

On Tue, Dec 20, 2011 at 21:27, Andrej Mitrovic andrej.mitrov...@gmail.com wrote: On 12/20/11, Philippe Sigaud philippe.sig...@gmail.com wrote: Why? I didn't think of using tuples first, initially I've tried using size_t[]... but that was a bad idea. But I still think it should be the first

Re: initializedArray

did need to use another array as an initializer. So the new implementation takes care of that via lockstep: from : http://www.ideone.com/gKFTK : unittest { auto arr2 = initializedArray!(int[][])([[1, 2], [3, 4]], 2, 2); assert(arr2 == [[1, 2], [3, 4]]); } 1) What's the difference

Re: initializedArray

: void main() { auto a = [[1, 2], [3, 4]]; auto b = a.dup; a[0][0] = 10; assert(b[] == [[1, 2], [3, 4]]); // fails, b[0][0] is 10 } 2) You can get the lengths of [[1,2],[3,4]], so the 2,2 args is redundant. What happens if you type: auto arr2 = initializedArray!(int[][])([[1, 2

Re: initializedArray

copy, it only copies the first elements. The first elements are two slices Ah OK. Where as your version does a deep dupping, I see. 2) You can get the lengths of [[1,2],[3,4]], so the 2,2 args is redundant. What happens if you type: auto arr2 = initializedArray!(int[][])([[1, 2], [3, 4]], 4

[Issue 7145] New: Implement initializedArray in std.array

http://d.puremagic.com/issues/show_bug.cgi?id=7145 Summary: Implement initializedArray in std.array Product: D Version: D2 Platform: Other OS/Version: Windows Status: NEW Severity: enhancement Priority: P2

[Issue 7145] Implement initializedArray in std.array

http://d.puremagic.com/issues/show_bug.cgi?id=7145 Andrej Mitrovic andrej.mitrov...@gmail.com changed: What|Removed |Added Attachment #1056|0 |1

[Issue 7145] Implement initializedArray in std.array

http://d.puremagic.com/issues/show_bug.cgi?id=7145 --- Comment #2 from Andrej Mitrovic andrej.mitrov...@gmail.com 2011-12-20 12:28:53 PST --- Created an attachment (id=1058) 3rd version This one adds initialization by another array's elements. Basically it's a deep-copy. -- Configure