alt Hacker NewsMany years ago when reading Redis code I saw the same pattern: they pass around simple pointer to data, but there is a fixed length metadata just before that.
Many years ago when reading Redis code I saw the same pattern: they pass around simple pointer to data, but there is a fixed length metadata just before that.
I assume it’s either Antirez’s sds or a variant / ancestor thereof, yes. It stores a control block at the head of the string, but the pointer points past that block, so it has metadata but “is” a C string.