Function get_column

include/rabitqlib/fastscan/fastscan.hpp:46–57

template <typename T, class TA>
static inline void get_column(
    const T* src, size_t rows, size_t cols, size_t row, size_t col, TA& dest
) {
    size_t k = 0;
    size_t max_k = std::min(rows - row, dest.size());
    for (; k < max_k; ++k) {
        dest[k] = src[((k + row) * cols) + col];
    }
    if (k < dest.size()) {
        std::fill(dest.begin() + k, dest.end(), 0);
    }
}

/**
 * @brief Pack quantization codes, store in blocks, the data orgnization is illustrated in
 * the link and kPerm0. Since we pack codes as 32-sized groups, if the num is not a multiple