🚀 go-pugleaf

lem$ /usr/local/gnubin/gdb mbm2d
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Reading symbol data from /tmp_mnt/home/vi/tmb/mbm/mbm2d...done.
Type "help" for a list of commands.
(gdb) run image model
Starting program: /tmp_mnt/home/vi/tmb/mbm/mbm2d image model

Program received signal 11, Segmentation fault
Reading in symbols for mbm2d.c...done.
0x2ca0 in makePairing (b=(double *) 0xd1f0, r=(double *) 0x0) (mbm2d.c line 208)
208			c=makeConstraint(b,r,u,r[4]);
(gdb) p image[0]@4
$1 = {0xd1f0, 0xd220, 0xd250, 0xd280}
(gdb) p (image*)(image[0]@4)
Invalid syntax in expression.            <<< this should be possible
(gdb) p (image[2])(image[0]@4)
Memory fault - core dumped               <<< this certainly shouldn't dump core
lem$

The other obvious choice to achieve the same effect also doesn't work:

(gdb) whatis image
type = double *[1000]
(gdb) p *image@4
$11 = {0xd1f0, 0xd220, 0xd250, 0xd280}
(gdb) p *(*image@4)@2
$12 = {0xd1f0, 0xd220}  <<< this is wrong for any sensible definition of "@"
(gdb)

There really should be a clean way to print 2D arrays that are represented
as vectors-of-vectors.