bvector

<ctl/bvector.h> provides bvec, a packed dynamic boolean vector. Values occupy one bit each; capacity is rounded to 64-bit words.

bvec flags = bvec_init();
bvec_push_back(&flags, true);
bvec_set(&flags, 0, false);
bvec_free(&flags);

API: init, size, capacity, empty, at, set, reserve, push_back, pop_back, clear, and free. at, set, and pop_back require valid indices/non-empty storage.