实现一个大小固定的矩阵

#include <iostream>#include <numeric>#include <algorithm>#include <cmath>#include <valarray>using namespace std;template<class Value_T, unsigned int N>class kvector{public:    Value_T m[N];    typedef Value_T value_type;     typedef Value_T* iterator;    typedef const Value_T* const_iterator;    typedef Value_T& reference;    typedef const Value_T& const_reference; typedef size_t size_type;    typedef kvector self;    template<typename Iter_T>    void copy(Iter_T first, Iter_T last) { copy(first, last, begin()); }    iterator begin() { return m; }    iterator end() { return m + N; }    const_iterator begin() const { return m; }    const_iterator end() const { return m + N; }    reference operator[] (size_type n) { return m[n]; }    const_reference operator[] (size_type n) const { return m[n]; }    static size_type size() { return N; }    self& operator+=(const self& x)     {        for (int i = 0; i < N; ++i )            m[i] += x.m[i];        return *this;    }    self& operator-=(const self& x)    {        for (int i = 0; i < N; ++i)            m[i] -= x.m[i];        return *this;    }    self& operator=(value_type x)    {        fill(begin(), end(), x);        return *this;    }    self& operator+=(value_type x)    {        for (int i = 0; i < N; ++i)            m[i] += x;        return *this;    }    self& operator-=(value_type x)    {        for (int i = 0; i < N; ++i)            m[i] -= x;        return *this;    }    self& operator*=(value_type x)    {        for (int i = 0; i < N; ++i)            m[i] *= x;        return *this;    }    self& operator/=(value_type x)    {        for (int i = 0; i < N; ++i)            m[i] /= x;        return *this;    }    self& operator%=(value_type x)    {        for (int i = 0; i < N; ++i)            m[i] %= x;        return *this;    }    self operator-()    {        self x;        for (int i = 0; i < N; ++i)            x.m[i] = -x.m[i];        return x;    }    friend self operator+(self x, const self& y) { return x += y; }    friend self operator-(self x, const self& y) { return x -= y; }    friend self operator+(self x, value_type y) { return x += y; }    friend self operator-(self x, value_type y) { return x -= y; }    friend self operator*(self x, value_type y) { return x *= y; }    friend self operator/(self x, value_type y) { return x /= y; }    friend self operator%(self x, value_type y) { return x %= y; }};template<class Iter_T, int Step_N>class kstride_iter{public:    typedef typename std::iterator_traits<Iter_T>::value_type value_type;    typedef typename std::iterator_traits<Iter_T>::reference reference;    typedef typename std::iterator_traits<Iter_T>::difference_type difference_type;    typedef typename std::iterator_traits<Iter_T>::pointer pointer;    typedef std::random_access_iterator_tag iterator_category;    typedef kstride_iter self;    kstride_iter() : m(NULL) {}    kstride_iter(const self& x) : m(x.m) {}    explicit kstride_iter(Iter_T x) : m(x) {}    explicit kstride_iter(Iter_T x, int step) : m(x) { Step_N = step; }    self& operator++() { m += Step_N; return *this; }    self operator++(int) { self tmp = *this; m += Step_N; return tmp; }    self& operator+=(difference_type x) { m += x * Step_N; return *this; }    self& operator--() { m -= Step_N; return *this; }    self operator--(int) { self tmp = *this; m -= Step_N; return tmp; }    self& operator-=(difference_type x) { m -= x * Step_N; return *this; }    reference operator[](difference_type n) { return m[n*Step_N]; }    reference operator*() { return *m; }    friend bool operator==(self x, self y) { return x.m == y.m; }    friend bool operator!=(self x, self y) { return x.m != y.m; }    friend bool operator<(self x, self y) { return x.m < y.m; }    friend difference_type operator-(self x, self y) { return (x.m - y.m) / Step_N; }    friend self operator+(self x, difference_type y) { return x += y * Step_N; }    friend self operator+(difference_type x, self y) { return y += x * Step_N; }private:    Iter_T m;};template<class Value_T, int Rows_N, int Cols_N>class kmatrix{public:    typedef Value_T value_type;    typedef kmatrix self;    typedef value_type* iterator;    typedef const value_type* const_iterator;    typedef kstride_iter<Value_T*, 1> row_type;    typedef kstride_iter<value_type*, Cols_N> col_type;    typedef kstride_iter<const Value_T*, 1> const_row_type;    typedef kstride_iter<const value_type*, Cols_N> const_col_type;    static const int nRows = Rows_N;    static const int nCols = Cols_N;    kmatrix()  { m = Value_T(); }    kmatrix(const self& x)  { m = x.m; }    explicit kmatrix(Value_T& x) { m = x.m; }    static int rows() { return Rows_N; }    static int cols() { return Cols_N; }    static int size() { return Rows_N * Cols_N; }    row_type row(int n) { return row_type(begin() + (n * Cols_N)); }    col_type col(int n) { return col_type(begin() + n); }    const_row_type row(int n) const { return const_row_type(begin() + (n * Cols_N)); }    const_col_type col(int n) const { return const_col_type(begin() + n);  }    iterator begin() { return m.begin(); }    iterator end() { return m.begin() + size(); }    const_iterator begin() const { return m; }    const_iterator end() const { return m + size(); }    self& operator=(const self& x) { m = x.m; return *this; }    self& operator=(value_type x) { m = x; return *this; }    row_type operator[] (int n) { return row(n); }    const_row_type operator[] (int n) const { return row(n); }    self& operator+=(const self& x) { m += x.m; return *this; }    self& operator-=(const self& x) { m -= x.m; return *this; }    self& operator+=(value_type x) { m += x; return *this; }    self& operator-=(value_type x) { m -= x; return *this; }    self& operator*=(value_type x) { m *= x; return *this; }    self& operator/=(value_type x) { m /= x; return *this; }    self operator-() { return -m; }    friend self operator+(self x, const self& y) { return x += y; }    friend self operator-(self x, const self& y) { return x -= y; }    friend self operator+(self x, value_type y) { return x += y;  }    friend self operator-(self x, value_type y) { return x -= y;  }    friend self operator*(self x, value_type y) { return x *= y;  }    friend self operator/(self x, value_type y) { return x /= y;  }    friend bool operator==(const self& x, const self& y) { return x != y; }    friend bool operator!=(const self& x, const self& y) { return x.m != y.m; }private:    kvector<Value_T, (Rows_N + 1) * Cols_N> m;};template<class Iter_T>void outputRowOrColum(Iter_T iter, int n){    for (int i = 0; i < n; ++i)        cout << iter[i] << " ";    cout << endl;}template<class Matrix_T>void initializeMatrix(Matrix_T& m){    int k = 0;    for (int i = 0; i < m.rows(); ++i)        for (int j = 0; j < m.cols(); ++j)            m[i][j] = k++;}template<class Matrix_T>void outputMatrix(Matrix_T& m){    for (int i = 0; i < m.rows(); ++i)    {        cout << "Row " << i << " = ";        outputRowOrColum(m.row(i), m.cols());    }    for (int i = 0; i < m.cols(); ++i)    {        cout << "Column " << i << " = ";        outputRowOrColum(m.col(i), m.rows());    }}int main(int argc, char** argv){    kmatrix<int , 2, 4> m;    initializeMatrix(m);    m *= 2;    outputMatrix(m);    system("pause");    return 0;}