Nice solution.
I didn't understood how a "vala struct" could be interpreted as a C union;
this example clarifies it well.
Thanks for sharing.
--
nadir
2012/7/20 Sebastian Reichel <s...@ring0.de>
>
> How about defining the union in C and making it available in Vala
> with a vapi file?
>
> == reg.h ==
> #include <stdint.h>
>
> typedef struct {
> uint8_t lo;
> uint8_t hi;
> } WORD;
>
> typedef union {
> uint16_t reg16;
> WORD reg8;
> } REG;
>
> == reg.vapi ==
> [CCode (cheader_filename = "reg.h")]
> public struct WORD {
> uint8 lo;
> uint8 hi;
> }
>
> [CCode (cheader_filename = "reg.h")]
> public struct REG {
> uint16 reg16;
> WORD reg8;
> }
>
> == test.vala ==
> public static int main(string[] args) {
> REG register = REG();
> register.reg16 = 0;
> register.reg8.lo = 0x23;
> register.reg8.hi = 0x42;
> stdout.printf("%04x\n", register.reg16);
> return 0;
> }
>
> == demo ==
> $ valac test.vala reg.vapi
> $ ./test
> 4223
>
> -- Sebastian
>
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