• Justin Johansson <no spam.com> Oct 08 2009
• Jarrett Billingsley <jarrett.billingsley gmail.com> Oct 08 2009
• Justin Johansson <no spam.com> Oct 08 2009
• Justin Johansson <no spam.com> Oct 08 2009
• Christopher Wright <dhasenan gmail.com> Oct 08 2009
• bearophile <bearophileHUGS lycos.com> Oct 08 2009
• Ellery Newcomer <ellery-newcomer utulsa.edu> Oct 08 2009
• Jarrett Billingsley <jarrett.billingsley gmail.com> Oct 08 2009

Justin Johansson <no spam.com> writes:

I almost have to apologize for this question but ..

How does one initialize a static rectangular array (2-d matrix) in D1?

None of the following or other variations that I've tried compile with DMD 1.0.

int[2, 3] matrix = [ 1, 2, 3,  4, 5, 6 ]; 

int[2, 3] matrix = [[ 1, 2, 3 ], [ 4, 5, 6 ]]; 

Thanks for all help.

Jarrett Billingsley <jarrett.billingsley gmail.com> writes:

On Thu, Oct 8, 2009 at 8:10 PM, Justin Johansson <no spam.com> wrote:
 I almost have to apologize for this question but ..

 How does one initialize a static rectangular array (2-d matrix) in D1?

 None of the following or other variations that I've tried compile with DM=


 int[2, 3] matrix =3D [ 1, 2, 3, =A04, 5, 6 ];


..that's not how you declare a rectangular array type. It's int[3][2].

int[3][2] matrix =3D [[1, 2, 3], [4, 5, 6]];

Justin Johansson <no spam.com> writes:

Jarrett Billingsley Wrote:

 On Thu, Oct 8, 2009 at 8:10 PM, Justin Johansson <no spam.com> wrote:
 I almost have to apologize for this question but ..

 How does one initialize a static rectangular array (2-d matrix) in D1?

 None of the following or other variations that I've tried compile with DMD 1.0.

 int[2, 3] matrix = [ 1, 2, 3,  4, 5, 6 ];


 ..that's not how you declare a rectangular array type. It's int[3][2].
 
 int[3][2] matrix = [[1, 2, 3], [4, 5, 6]];


Of course.  Blonde moment.  Worked 18 hrs yesterday & not enough sleep. :-(

Justin Johansson <no spam.com> writes:

Jarrett Billingsley Wrote:

 On Thu, Oct 8, 2009 at 8:10 PM, Justin Johansson <no spam.com> wrote:
 I almost have to apologize for this question but ..

 How does one initialize a static rectangular array (2-d matrix) in D1?

 None of the following or other variations that I've tried compile with DMD 1.0.

 int[2, 3] matrix = [ 1, 2, 3,  4, 5, 6 ];


 ..that's not how you declare a rectangular array type. It's int[3][2].
 
 int[3][2] matrix = [[1, 2, 3], [4, 5, 6]];


Thanks Jarrett.

Am I having a blonde day?

   int[2,3] m = [ 1, 2, 3 ]; 
   writefln( "m=%s, .sizeof=%d", m, m.sizeof);

Compiles and prints:

m=[1,2,3], .sizeof=12

So what does that declaration, int[2,3], mean?

Think this is what threw me initially.

Thanks, Justin

Christopher Wright <dhasenan gmail.com> writes:

Justin Johansson wrote:
 Jarrett Billingsley Wrote:
 
 On Thu, Oct 8, 2009 at 8:10 PM, Justin Johansson <no spam.com> wrote:
 I almost have to apologize for this question but ..

 How does one initialize a static rectangular array (2-d matrix) in D1?

 None of the following or other variations that I've tried compile with DMD 1.0.

 int[2, 3] matrix = [ 1, 2, 3,  4, 5, 6 ];



 int[3][2] matrix = [[1, 2, 3], [4, 5, 6]];


 Thanks Jarrett.
 
 Am I having a blonde day?
 
    int[2,3] m = [ 1, 2, 3 ]; 
    writefln( "m=%s, .sizeof=%d", m, m.sizeof);
 
 Compiles and prints:
 
 m=[1,2,3], .sizeof=12
 
 So what does that declaration, int[2,3], mean?
 
 Think this is what threw me initially.
 
 Thanks, Justin


2,3 is a comma expression. Evaluate everything, and return the rightmost 
value.

bearophile <bearophileHUGS lycos.com> writes:

Jarrett Billingsley Wrote:

 Bahahaha, oh comma exps.


Their usage will need to be quite regulated in D (using them for smarter
purposes is a cute idea, but it may impair C compatibility).

Bye,
bearophile

Ellery Newcomer <ellery-newcomer utulsa.edu> writes:

Justin Johansson wrote:
 Jarrett Billingsley Wrote:
 
 On Thu, Oct 8, 2009 at 8:10 PM, Justin Johansson <no spam.com> wrote:


 Thanks Jarrett.
 
 Am I having a blonde day?
 
    int[2,3] m = [ 1, 2, 3 ]; 
    writefln( "m=%s, .sizeof=%d", m, m.sizeof);
 
 Compiles and prints:
 
 m=[1,2,3], .sizeof=12
 
 So what does that declaration, int[2,3], mean?
 
 Think this is what threw me initially.
 
 Thanks, Justin
 


It probably means DMD isn't doing enough validation checking.

Comma expression, hence typeof(m) is int[3], m.sizeof is 3 * int.sizeof

Jarrett Billingsley <jarrett.billingsley gmail.com> writes:

On Thu, Oct 8, 2009 at 10:05 PM, Christopher Wright <dhasenan gmail.com> wr=
ote:
 Justin Johansson wrote:
 Jarrett Billingsley Wrote:

 On Thu, Oct 8, 2009 at 8:10 PM, Justin Johansson <no spam.com> wrote:
 I almost have to apologize for this question but ..

 How does one initialize a static rectangular array (2-d matrix) in D1?

 None of the following or other variations that I've tried compile with
 DMD 1.0.

 int[2, 3] matrix =3D [ 1, 2, 3, =A04, 5, 6 ];


 ..that's not how you declare a rectangular array type. It's int[3][2].

 int[3][2] matrix =3D [[1, 2, 3], [4, 5, 6]];


 Thanks Jarrett.

 Am I having a blonde day?

 =A0 int[2,3] m =3D [ 1, 2, 3 ]; =A0 writefln( "m=3D%s, .sizeof=3D%d", m,=




 Compiles and prints:

 m=3D[1,2,3], .sizeof=3D12

 So what does that declaration, int[2,3], mean?

 Think this is what threw me initially.

 Thanks, Justin


 2,3 is a comma expression. Evaluate everything, and return the rightmost
 value.


Bahahaha, oh comma exps.