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dtype(..., align=True) does not insert trailing padding (Trac #1790) #2383
Description
Original ticket http://projects.scipy.org/numpy/ticket/1790 on 2011-04-02 by @pv, assigned to @mwiebe.
Note the following:
>>> dt = np.dtype([('a', 'b'), ('b', 'i'), ('c', 'b')], align=True)
>>> dt.itemsize
9
whereas
#include <stdio.h>
typedef struct {
char a;
int b;
char c;
} xxx_t;
int main()
{
printf("%d\n", sizeof(xxx_t));
return 0;
}
/* -> sizeof(xxx_t) == 12 */
Changing this might cause problems in third-party code. On the other hand, align=True is probably not that often used.
Activity
numpy-gitbot commentedon Oct 23, 2012
@charris wrote on 2011-04-02
See also ticket #2215.
numpy-gitbot commentedon Oct 23, 2012
@mwiebe wrote on 2011-06-21
The truth is actually worse, the different parsing methods are inconsistent. From ticket #2215:
I'm going to change it to always put in the trailing padding.
numpy-gitbot commentedon Oct 23, 2012
@mwiebe wrote on 2011-06-23
Fixed in f57f1ef.
numpy-gitbot commentedon Oct 23, 2012
Milestone changed to
NumPy 1.7by @charris on 2012-04-26