Hi,

I'm trying to map a C structure to Java using JNA. I came across something that I've never seen.

The struct definition is as follow,

struct op 
{
    unsigned op_type:9;  //---> what does this means? 
    unsigned op_opt:1; 
    unsigned op_latefree:1; 
    unsigned op_latefreed:1; 
    unsigned op_attached:1; 
    unsigned op_spare:3; 
    U8 op_flags; 
    U8 op_private;
};

you can see some variable being defined like unsigned op_attached:1 and I'm unsure what would that mean: would that effect number of bytes to be allocated for this particular variable?

any help?

Thanks,

Munir