78 lines
1.5 KiB
C
78 lines
1.5 KiB
C
#include <stdint.h>
|
|
|
|
struct Bits {
|
|
uint32_t : 1;
|
|
uint32_t b1 : 1;
|
|
uint32_t b2 : 2;
|
|
uint32_t : 2;
|
|
uint32_t b3 : 3;
|
|
// Unnamed bitfield (this will get removed).
|
|
uint32_t : 2;
|
|
uint32_t b4 __attribute__ ((aligned(16)));
|
|
uint32_t b5 : 5;
|
|
uint32_t b6 : 6;
|
|
uint32_t b7 : 7;
|
|
uint32_t four : 4;
|
|
};
|
|
|
|
struct MoreBits {
|
|
uint32_t a : 3;
|
|
uint8_t : 1;
|
|
uint8_t b : 1;
|
|
uint8_t c : 1;
|
|
uint8_t d : 1;
|
|
};
|
|
struct MoreBits more_bits;
|
|
|
|
struct ManySingleBits {
|
|
uint16_t b1 : 1, b2 : 1, b3 : 1, b4 : 1, b5 : 1, b6 : 1, b7 : 1, b8 : 1,
|
|
b9 : 1, b10 : 1, b11 : 1, b12 : 1, b13 : 1, b14 : 1, b15 : 1, b16 : 1,
|
|
b17 : 1;
|
|
};
|
|
struct ManySingleBits many_single_bits;
|
|
|
|
struct LargePackedBits {
|
|
uint64_t a : 36;
|
|
uint64_t b : 36;
|
|
} __attribute__((packed));
|
|
|
|
#pragma pack(1)
|
|
struct PackedBits {
|
|
char a;
|
|
uint32_t b : 5, c : 27;
|
|
};
|
|
#pragma pack()
|
|
|
|
int main(int argc, char const *argv[]) {
|
|
struct Bits bits;
|
|
bits.b1 = 1;
|
|
bits.b2 = 3;
|
|
bits.b3 = 7;
|
|
bits.b4 = 15;
|
|
bits.b5 = 31;
|
|
bits.b6 = 63;
|
|
bits.b7 = 127;
|
|
bits.four = 15;
|
|
|
|
more_bits.a = 3;
|
|
more_bits.b = 0;
|
|
more_bits.c = 1;
|
|
more_bits.d = 0;
|
|
|
|
many_single_bits.b1 = 1;
|
|
many_single_bits.b5 = 1;
|
|
many_single_bits.b7 = 1;
|
|
many_single_bits.b13 = 1;
|
|
|
|
struct PackedBits packed;
|
|
packed.a = 'a';
|
|
packed.b = 10;
|
|
packed.c = 0x7112233;
|
|
|
|
struct LargePackedBits large_packed =
|
|
(struct LargePackedBits){0xcbbbbaaaa, 0xdffffeeee};
|
|
struct LargePackedBits *large_packed_ptr = &large_packed;
|
|
|
|
return 0; // break here
|
|
}
|