[racket] FFI bitfields

Is it planned to add this support? I roughly imagine, how to make bit fields inside int , but C standard allows bit fields to be, for example, 35 bit total. 


Вторник, 11 июня 2013, 6:03 -07:00 от Matthew Flatt <mflatt at cs.utah.edu>:
>At Sun, 09 Jun 2013 21:42:47 +0400, Клочков Роман wrote:
>>  How to make in Racket FFI struct with bit fields
>> For example, such struct
>> 
>> struct box_props
>> {
>>      unsigned int opaque       : 1;
>>      unsigned int fill_color   : 3;
>>      unsigned int              : 4; // fill to 8 bits
>>      unsigned int show_border  : 1;
>>      unsigned int border_color : 3;
>>      unsigned int border_style : 2;
>>      unsigned int              : 2; // fill to 16 bits
>> };
>> 
>> ?
>
>The `ffi/unsafe' library currently doesn't include support for
>bitfields. I think you have to declare a structure with an integer and
>use operations like `arithmetic-shift' and `bitwise-and' to manipulate
>bits in the integer.
>


-- 
Роман Клочков