Matrix

#ifndef MATRIX_H#define MATRIX_Htemplate<int size,typename T>class Matrix{public:    typedef T value_type;    explicit Matrix(const T &val = T());    Matrix(const Matrix &);    template<typename C>    Matrix(const Matrix<size,C> &another)    {        this->assign(another);    }    void assign(const Matrix &);    template<typename C>    void assign(const Matrix<size,C> &another)    {        for(int i=0;i<size;++i)            for(int j=0;j<size;++j)                m[i][j] = another.m[i][j];    }    void fill(const T &val);    T &operator()(int row,int column){return m[row][column];}    const T &operator()(int row,int column) const {return m[row][column];}    Matrix &operator=(const Matrix &another){ this->assign(another); return *this;}    template<typename C>    Matrix &operator=(const Matrix<size,C> &another){ this->assign(another); return *this;}private:    T m[size][size];};template<int size,typename T>Matrix<size,T>::Matrix(const T &val){    this->fill(val);}template<int size,typename T>Matrix<size,T>::Matrix(const Matrix & another){    this->assign(another);}template<int size,typename T>void Matrix<size,T>::fill(const T &val){    for(int i=0;i<size;++i)        for(int j=0;j<size;++j)            m[i][j] = val;}template<int size,typename T>Matrix<size,T> &Matrix<size,T>::assign(const Matrix &another){    for(int i=0;i<size;++i)        for(int j=0;j<size;++j)            m[i][j] = another.m[i][j];}#endif // MATRIX_H