Multi-dimensional heap array

[JKop]

int main()
{
int normal[2][3];

int (&on_the_heap)[2][3] = *new int[2][3];
}
My operator precendence may be wrong in the above.
-JKop

[Derrick Coetzee]

JKop wrote:

int (&on_the_heap)[2][3] = *new int[2][3];

There is no language construct for dynamically allocating
multidimensional arrays. See the comp.lang.c FAQ question 6.16 and
related questions:

http://www.eskimo.com/~scs/C-faq/q6.16.html

(Substitute new for malloc appropriately)
--
Derrick Coetzee
I grant this newsgroup posting into the public domain. I disclaim all
express or implied warranty and all liability. I am not a professional.

[JKop]

Derrick Coetzee posted:

JKop wrote:

int (&on_the_heap)[2][3] = *new int[2][3];
There is no language construct for dynamically allocating
multidimensional arrays. See the comp.lang.c FAQ question

6.16 and related questions:

http://www.eskimo.com/~scs/C-faq/q6.16.html

(Substitute new for malloc appropriately)

I've done it before. I used a reference or a pointer to a
multidimensional array I believe.

Something along the lines of:

int k[8];

int (&r)[2] = k;

r[0][1] = 1;
r[0][2] = 2;
r[0][3] = 3;
r[0][4] = 4;
r[1][1] = 5;
r[1][2] = 6;

//and so on
-JKop

[Ioannis Vranos]

JKop wrote:

int main()
{
int normal[2][3];

int (&on_the_heap)[2][3] = *new int[2][3];
}
My operator precendence may be wrong in the above.

int (*p)[3]=new int[2][3];

// ...
delete[] p;


Regards,

Ioannis Vranos

http://www23.brinkster.com/noicys

[Ioannis Vranos]

Derrick Coetzee wrote:

JKop wrote:

int (&on_the_heap)[2][3] = *new int[2][3];

There is no language construct for dynamically allocating
multidimensional arrays.

What?


See the comp.lang.c FAQ question 6.16 and
related questions:

http://www.eskimo.com/~scs/C-faq/q6.16.html

It is C++ here, not C. But I just checked that FAQ. Who wrote that CRAP?

Even the casts it has in malloc are not needed in C!
In any case in C it can be done:
#include <stdlib.h>

/* ... */

int (*p)[3]=malloc(2*sizeof(*p));

/* ... */

free(p);


Regards,

Ioannis Vranos

http://www23.brinkster.com/noicys

[Andre Kostur]

JKop <NU**@NULL.NULL> wrote in news:IX******************@news.indigo.ie:

Derrick Coetzee posted:

JKop wrote:

int (&on_the_heap)[2][3] = *new int[2][3];

There is no language construct for dynamically allocating
multidimensional arrays. See the comp.lang.c FAQ question

6.16 and

related questions:

http://www.eskimo.com/~scs/C-faq/q6.16.html

(Substitute new for malloc appropriately)

I've done it before. I used a reference or a pointer to a
multidimensional array I believe.

Something along the lines of:

int k[8];

int (&r)[2] = k;

r[0][1] = 1;
r[0][2] = 2;
r[0][3] = 3;
r[0][4] = 4;
r[1][1] = 5;
r[1][2] = 6;

//and so on

And what does this have to do with dynamically allocating
multidimensional arrays?

[JKop]

Andre Kostur posted:

JKop <NU**@NULL.NULL> wrote in news:IXl_c.26563$Z14.8409 @news.indigo.ie:

Derrick Coetzee posted:

JKop wrote:
int (&on_the_heap)[2][3] = *new int[2][3];

There is no language construct for dynamically allocating multidimensional arrays. See the comp.lang.c FAQ question 6.16 and related questions:

http://www.eskimo.com/~scs/C-faq/q6.16.html

(Substitute new for malloc appropriately)

I've done it before. I used a reference or a pointer to a multidimensional array I believe.

Something along the lines of:

int k[8];

int (&r)[2] = k;

r[0][1] = 1;
r[0][2] = 2;
r[0][3] = 3;
r[0][4] = 4;
r[1][1] = 5;
r[1][2] = 6;

//and so on

And what does this have to do with dynamically allocating
multidimensional arrays?

Do I have to do EVERYTHING myself?! Just make k dynamically
allocated:

int& k = *new int[8];

[Ioannis Vranos]

Ioannis Vranos wrote:

It is C++ here, not C. But I just checked that FAQ. Who wrote that CRAP?

Even the casts it has in malloc are not needed in C!
In any case in C it can be done:
#include <stdlib.h>

/* ... */

int (*p)[3]=malloc(2*sizeof(*p));

/* ... */

free(p);

The above implies that one dimension must be known.


Regards,

Ioannis Vranos

http://www23.brinkster.com/noicys

[Old Wolf]

Ioannis Vranos <iv*@guesswh.at.grad.com> wrote:

Derrick Coetzee wrote:

JKop wrote:

int (&on_the_heap)[2][3] = *new int[2][3];
There is no language construct for dynamically allocating
multidimensional arrays.

Crap, as demonstrated by JKop's example

See the comp.lang.c FAQ question 6.16 and
related questions:

http://www.eskimo.com/~scs/C-faq/q6.16.html

It is C++ here, not C. But I just checked that FAQ. Who wrote that CRAP?

Even the casts it has in malloc are not needed in C!

That's been fixed in the text version of the faq (nobody bothers
to update the HTML version).