Mark Dickinson <[email protected]> added the comment:
> For example, I would expect the same padding for 'BT{I}' and 'BI'.
Granted, yes. But I wouldn't expect the same padding for 'BT{BI}' and 'BBI'.
'BT{BI}' should match a C struct which itself has an embedded struct. For C, I
get the following results on my machine:
#include <stdio.h>
/* corresponds to 'T{BI}' */
typedef struct {
char y;
int z;
} A;
/* corresponds to 'BT{BI}' */
typedef struct {
char x;
A yz;
} B;
/* corresponds to 'BBI' */
typedef struct {
char x;
char y;
int z;
} C;
int main(void) {
printf("sizeof(A) = %zu\n", sizeof(A));
printf("sizeof(B) = %zu\n", sizeof(B));
printf("sizeof(C) = %zu\n", sizeof(C));
return 0;
}
/*
Results on a (64-bit) OS X 10.6 machine:
sizeof(A) = 8
sizeof(B) = 12
sizeof(C) = 8
*/
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<http://bugs.python.org/issue3132>
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