On 4/19/2009 10:50 PM, Dag Sverre Seljebotn wrote:
> Could we have some kind of keyword to define packed structs in Cython?
> This is not part of the C standard, but is supported in most C compilers
> through extensions.
Since it's not in the standard, there is no standard syntax for this.
But you can fake it using a char array and some constants storing offsets.
/*
cdef packed struct MyStruct:
char a
double b
*/
const int mystruct_size = sizeof(char)+sizeof(double);
const int mystruct_offset_a = 0;
const int mystruct_offset_b = sizeof(char);
/*
cdef MyStruct mystruct
*/
char mystruct[mystruct_size]; /* sizeof(char) is 1 by defintion */
/*
cdef char a
cdef double b
a = mystruct.a
b = mystruct.b
*/
char a;
double b;
a = *(char *)((char *)mystruct + mystruct_offset_a);
b = *(double *)((char *)mystruct + mystruct_offset_b);
Sturla Molden
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