import core.bitop; int main() { assert(bsf(0x21) == 0); return 0; }
import core.bitop; int main() { assert(bsr(0x21) == 5); return 0; }
size_t array[2]; array[0] = 2; array[1] = 0x100; assert(bt(array.ptr, 1)); assert(array[0] == 2); assert(array[1] == 0x100);
size_t* p | a non-NULL pointer to an array of size_ts. |
size_t bitnum | a bit number, starting with bit 0 of p[0],
and progressing. It addresses bits like the expression:
p[index / (size_t.sizeof*8)] & (1 << (index & ((size_t.sizeof*8) - 1))) |
size_t array[2]; array[0] = 2; array[1] = 0x100; assert(btc(array.ptr, 35) == 0); if (size_t.sizeof == 8) { assert(array[0] == 0x8_0000_0002); assert(array[1] == 0x100); } else { assert(array[0] == 2); assert(array[1] == 0x108); } assert(btc(array.ptr, 35)); assert(array[0] == 2); assert(array[1] == 0x100); assert(bts(array.ptr, 35) == 0); if (size_t.sizeof == 8) { assert(array[0] == 0x8_0000_0002); assert(array[1] == 0x100); } else { assert(array[0] == 2); assert(array[1] == 0x108); } assert(btr(array.ptr, 35)); assert(array[0] == 2); assert(array[1] == 0x100);