c++ - 如何翻转内存块中的任何位？

Question

如何翻转内存块中的任何位:

int size = 4000;
void* block = malloc(size);
bzero(block, size);
// flip bit #100 in block

谢谢

Answer 1

void flip_bit (void *block, int bit)
{
    unsigned char *b = (unsigned char *) block;
    b[bit/8] ^= 1 << (bit % 8);
}