Method seek_existance

common/unordered_inline_set.h:192–197

protected:
    size_t seek_existance(size_t i, size_t delta) {
        for (; i < _capacity; i += delta)
            if (get_bit(i))
                return i;
        return _capacity;
    }
    iterator _begin() noexcept {
        return {this, seek_existance(0, 1)};
    }