• rombankzero (12/16) Aug 29 2019 Hey, everybody! I'm having Array Problems™. The documentation on
• Les De Ridder (9/16) Aug 29 2019 It's a known bug[1].
• kinke (2/4) Aug 29 2019 Or LDC, and GDC probably too.
• kinke (4/10) Aug 29 2019 Sorry, that was wrt. the linked bugzilla and not this example
• rombankzero (4/7) Aug 29 2019 I guess I'll use this workaround, though obviously it becomes

rombankzero <bogomancer gmail.com> writes:

Hey, everybody! I'm having Array Problems™. The documentation on 
arrays says that you can initialize all elements of a rectangular 
array with the following syntax:

 double[6][3] matrix = 0; // Sets all elements to 0.

However this doesn't appear to work for static initialization:

 static double[6][3] matrix = 0; // Error: cannot implicitly 
 convert expression `0` of type `int` to `double[6][3]`

More confusingly, it *does* work for one-dimensional static 
arrays:

 static double[6] matrix = 0; // Thumbs up from the compiler.

Is this a bug, or am I missing something? It would be really 
convenient to be able to statically initialize rectangular arrays 
in this way. Example: I have a struct that has a member that's a 
rectangular float array, but I have no way of telling the 
compiler that I want it default-initialized to all-zeroes 
(instead of NaNs)!

Les De Ridder <les lesderid.net> writes:

On Thursday, 29 August 2019 at 15:10:26 UTC, rombankzero wrote:
 [...]

 Is this a bug, or am I missing something? It would be really 
 convenient to be able to statically initialize rectangular 
 arrays in this way. Example: I have a struct that has a member 
 that's a rectangular float array, but I have no way of telling 
 the compiler that I want it default-initialized to all-zeroes 
 (instead of NaNs)!

It's a known bug[1].

As a workaround you could use a `static this()`:

static double[6][3] matrix;

static this()
{
     matrix = 0;
}

[1] https://issues.dlang.org/show_bug.cgi?id=19178

kinke <noone nowhere.com> writes:

On Thursday, 29 August 2019 at 18:11:50 UTC, Les De Ridder wrote:
 It's a known bug[1].

 As a workaround you could use a `static this()`:

Or LDC, and GDC probably too.

kinke <noone nowhere.com> writes:

On Thursday, 29 August 2019 at 18:59:22 UTC, kinke wrote:
 On Thursday, 29 August 2019 at 18:11:50 UTC, Les De Ridder 
 wrote:
 It's a known bug[1].

 As a workaround you could use a `static this()`:

 Or LDC, and GDC probably too.

Sorry, that was wrt. the linked bugzilla and not this example 
here. - What does work is `static double[6][3] matrix = [0, 0, 
0]`, i.e., initializing each nested 1D array with a scalar 0.

rombankzero <bogomancer gmail.com> writes:

On Thursday, 29 August 2019 at 19:06:04 UTC, kinke wrote:
 Sorry, that was wrt. the linked bugzilla and not this example 
 here. - What does work is `static double[6][3] matrix = [0, 0, 
 0]`, i.e., initializing each nested 1D array with a scalar 0.

I guess I'll use this workaround, though obviously it becomes 
more impractical the larger the outermost array dimension is 
¯\_(ツ)_/¯