我见过ELF哈希算法中使用的tilde运算符，我很好奇它的作用.(代码是from Eternally Confused.)
unsigned elf_hash ( void *key, int len )
{
unsigned char *p = key;
unsigned h = 0, g;
int i;
for ( i = 0; i < len; i++ ) {
h = ( h << 4 ) + p[i];
g = h & 0xf0000000L;
if ( g != 0 )
h ^= g >> 24;
h &= ~g;
}
return h;
}