Function bit_array_clear

src/butil/bit_array.h:46–53

Set bit 0 ~ nbit-1 of |array| to be 0

// Set bit 0 ~ nbit-1 of |array| to be 0
inline void bit_array_clear(uint64_t* array, size_t nbit) {
    const size_t off = (nbit >> 6);
    memset(array, 0, off * 8);
    const size_t last = (off << 6);
    if (last != nbit) {
        array[off] &= ~((((uint64_t)1) << (nbit - last)) - 1);
    }
}

// Set i-th bit (from left, counting from 0) of |array| to be 1
inline void bit_array_set(uint64_t* array, size_t i) {