Method erase_bit

common/unordered_inline_set.h:27–30

        *c |= (1 << (i % 8));
    }
    void erase_bit(size_t i) {
        auto c = (char*)_ptr - i / 8 - 1;
        *c &= ~(1 << (i % 8));
    }
    size_t get_s(size_t capacity) const {
        auto u = sizeof(T) * 8;
        return (capacity + u - 1) / u;