Переписать структуру со стандарта c++11 под более ранний

struct MedianFilter {
    unsigned k;
    unsigned blocks;
    unsigned n;
    unsigned half;
    unsigned result;
 
    MedianFilter(unsigned half_, unsigned blocks_) :
        k {2 * half_ + 1},
        blocks {blocks_},
        n {k * blocks_},
        half {half_},
        result {k * (blocks_ - 1) + 1}
    {
        if (half_ == 0) {
            throw std::invalid_argument("half-window size must be at least 1");
        }
        if (blocks_ == 0) {
            throw std::invalid_argument("number of blocks must be at least 1");
        }
        if (n / blocks != k) {
            throw std::overflow_error("input too large");
        }
    }
};

struct Buffer {
public:
    std::vector<std::pair<elem_t, unsigned>> sorted;
 
    explicit Buffer(MedianFilter f) :
        sorted(f.k),
        filter {f}
    {}
 
    void init(const elem_t* p) {
        for (unsigned i {0}; i < filter.k; ++i) {
            sorted[i] = std::make_pair(p[i], i);
        }
        std::sort(sorted.begin(), sorted.end());
    }
 
private:
    const MedianFilter filter;
};

sorted(f.k),
        filter {f}

MedianFilter(unsigned half_, unsigned blocks_) :
        k {2 * half_ + 1}
       {}

MedianFilter(unsigned half_, unsigned blocks_) 
        {k = 2 * half_ + 1;}