###### catik

2015-04-25 02:14 浏览 1.8k

# Ｃ＋＋模板类的问题，求解答

``````namespace mathematic {
template　< typename T  >
class mathBasic {
private:
int column_n;
int row_n;
public:
T **element;
mathBasic(int , int  = 0);
virtual ~mathBasic();
virtual void show();
int column() const {return column_n;};
int row() const {return row_n;};
int &column() {return column_n;};
int &row() {return row_n;};
T get(int , int = 0) const;
void set(T val, int x, int y = 0);
void set_whole(const mathBasic &);
T max();
T min();
mathBasic& operator+(const mathBasic &);
mathBasic& operator-(const mathBasic &);
template<class S> friend std::ostream &operator<<(std::ostream& os, mathBasic<S> &M);
｝；
template<　typename T　> class Matrix: public mathBasic<　T　> {
public:
Matrix();
Matrix(const Matrix<T> &);
Matrix(int , int );
Matrix(T **);
Matrix<T>& operator*(const Matrix<T> &);
void size() const;
void matrix_row(int r) const;
void matrix_column(int c) const;
Matrix<T>& operator=(const Matrix<T> &);
Matrix<T>& operator=(const mathBasic<T> &);
};
｝
namespace mathemathic {
template <typename T>
mathBasic<T>::mathBasic(int r, int c) {
if (!(r||c)) {
std::cout << "error, no size!" << std::endl;
element = null;
row_n = column_n = 1;
} else {
if (0 == c) {
column_n = 0;
c = 1;
} else {
column_n = c;
}
row_n = r;
element = new T*[r];
for (int i = 0; i < r; i++)
element[i] = new T[c]();
}
}
template <typename T>
mathBasic<T>::~mathBasic() {
for (int i = 0; i < row_n; i++)
delete[] element[i];
delete[] element;
element = null;
}
template <typename T>
void mathBasic<T>::show() {
int r, c;
int *width = new int[column() == 0? row():column()]();
int tempwid;
std::string num;
std::stringstream convert;
if (0 == column_n) {
c = 1;
} else {
c = column_n;
}
r = row_n;
for (int i = 0; i < c; i++) {
for (int j = 0; j < r; j++) {
convert << element[j][i];
convert >> num;
tempwid = num.size();
width[j] = width[j] < tempwid? tempwid:width[j];
}
}
for (int i = 0; i < r; i++)  {
std::cout << "| ";
for (int j = 0; j < c; j++) {
std::cout.setf(std::ios_base::left);
std::cout << std::setw(width[j]) << element[i][j] << " ";
}
std::cout << "|" << std::endl;
}
delete[] width;
}
template <typename T>
T mathBasic<T>::get(int r, int c) const{
return element[r][c];
}
template <typename T>
void mathBasic<T>::set(T val, int x, int y) {
element[x][y] = val;
}
template <typename T>
T mathBasic<T>::max() {
T max = element[0][0];
int r, c;
if (0 == column_n) {
c = 1;
} else {
c = column_n;
}
r = row_n;
for (int i = 0; i < r; i++) {
for (int j = 0; j < c; j++)
max = (element[i][j] > max ? element[i][j]:max);
}
return max;
}
template <typename T>
T mathBasic<T>::min() {
T min = element[0][0];
int r, c;
if (0 == column_n) {
c = 1;
} else {
c = column_n;
}
r = row_n;
for (int i = 0; i < r; i++) {
for (int j = 0; j < c; j++)
min = (element[i][j] < min ? element[i][j]:min);
}
return min;
}
template <typename T>
void mathBasic<T>::set_whole(const mathBasic<T> &one) {
int r, c;
r = one.row();
if (one.column() == 0)
c = 1;
for (int i = 0; i < row(); i++)
delete[] element[i];
delete element;
row() = one.row();
column() = one.column();
element = new T* [r];
for (int i = 0; i < r; i++)
element[i] = new T[c];
for (int i = 0; i < r; i++) {
for (int j = 0; j < c; j++) {
element[i][j] = one.element[i][j];
}
}
}
template <typename T>
mathBasic<T>& mathBasic<T>::operator-(const  mathBasic<T> &m) {
if (m.row_n != row_n||m.column_n != column_n) {
std::cout << "Size not matching, can\'t add!" << std::endl;
std::cout << "the left is returned" << std::endl;
return *this;
}
int r, c;
r = row_n;
if ((c = column_n) == 0) {
c = 1;
}
static mathBasic<T> temp(row_n, column_n);
for (int i = 0; i < r; i++) {
for (int j = 0; j < c; j++) {
temp.element[i][j] = element[i][j] - m.element[i][j];
}
}
return temp;
}
template <typename T>
mathBasic<T>& mathBasic<T>::operator+(const mathBasic<T> &m) {
if (m.row_n != row_n||m.column_n != column_n) {
std::cout << "Size not matching, can\'t add!" << std::endl;
std::cout << "the left is returned" << std::endl;
return *this;
}
int r, c;
r = row_n;
if ((c = column_n) == 0) {
c = 1;
}
static mathBasic<T> temp(row_n, column_n);
for (int i = 0; i < r; i++) {
for (int j = 0; j < c; j++) {
temp.element[i][j] = element[i][j] + m.element[i][j];
}
}
return temp;
}
template <typename T> std::ostream& operator<< (std::ostream& os, mathBasic<T>& M) {
M.show();
return os;
}
template <typename T>
Matrix<T>::Matrix(const Matrix<T> & mat):mathBasic(mat.mathBasic<T>::row(), mat.mathBasic<T>::column()) {
for (int i = 0; i < mathBasic<T>::row(); i++)
for (int j = 0; j < mathBasic<T>::column(); j++)
element[i][j] = mat.element[i][j];
}
template <typename T>
Matrix<T>::Matrix(T **m):mathBasic(2, 2) {
for (int i = 0; i < 2; i++)
for (int j = 0; j < 2; j++)
element[i][j] = *((T*)m + 2*i + j);
}
template <typename T>
Matrix<T>::Matrix():mathBasic(2, 2) {
for (int i = 0; i < 2; i++)
element[i][i] = 1;
}
template <typename T>
Matrix<T>::Matrix(int m, int n):mathBasic(m, n) {}
void Matrix<T>::size() const {
std::cout << mathBasic<T>::row() << " " << mathBasic<T>::column() << std::endl;
}
template <typename T>
void Matrix<T>::matrix_row(int r) const {
if (r >= mathBasic<T>::row()) {
std::cout << "error , exceed" << std::endl;
return ;
}
std::cout << "| ";
for (int i = 0; i < mathBasic<T>::column(); i++) {
std::cout << element[r][i] << " ";
}
std::cout << "|" << std::endl;
}
template <typename T>
void Matrix<T>::matrix_column(int c) const {
if (c >= mathBasic<T>::column()) {
std::cout << "error , exceed" << std::endl;
return ;
}
std::stringstream convert;
std::string num;
unsigned wide = 0;
for (int i = 0; i < mathBasic<T>::row(); i++) {
convert << element[i][c];
convert >> num;
wide = wide > num.size() ? wide:num.size();
}
for (int i = 0; i < mathBasic<T>::row(); i++)
std::cout << "|" << std::setw(wide) << element[i][c] << "|" << std::endl;
}
template <typename T>
Matrix<T>& Matrix::operator*(const Matrix<T> &m) {
if (mathBasic<T>::column() != m.mathBasic<T>::row()) {
std::cout << "Can not mulity" << std::endl;
return *this;
}
T sum;
static Matrix<T> temp(mathBasic<T>::row(), m.mathBasic<T>::column());
for (int i = 0; i < mathBasic<T>::row(); i++) {
for (int j = 0; j <m.mathBasic<T>::column(); j++) {
sum = 0;
for (int k = 0; k < mathBasic<T>::column(); k++) {
sum += element[i][k]*m.element[k][j];
}
temp.element[i][j] = sum;
}
}
return temp;
}
template <typename T>
Matrix<T>& Matrix::operator=(const Matrix<T> &mp) {
int r, c;
if ((mathBasic<T>::row() == 0&&mp.mathBasic<T>::row() != 0) || (mathBasic<T>::row() != 0&&mp.mathBasic<T>::row() == 0)) {
std::cout << "Different kind!" << std::endl;
return *this;
}
if (element != null) {
for (int i = 0; i < mathBasic<T>::row(); i++) {
delete[] element[i];
}
delete[] element;
}
c = mp.mathBasic<T>::column();
r = mp.mathBasic<T>::row();
mathBasic<T>::row() = mp.mathBasic<T>::row();
mathBasic<T>::column() = mp.mathBasic<T>::column();
element = new T*[r];
for (int i = 0; i < r; i++)
element[i] = new T[c]();
for (int i = 0; i < r; i++)
for (int j = 0; j < c; j++)
element[i][j] = mp.element[i][j];
return *this;
}
template <typename T>
Matrix<T>& Matrix::operator=(const mathBasic & mp) {
int r, c;
if ((mathBasic<T>::row() == 0&&mp.mathBasic<T>::row() != 0)||(mathBasic<T>::row() != 0&&mp.mathBasic<T>::row() == 0)) {
std::cout << "Different kind!" << std::endl;
return *this;
}
if (element != null) {
for (int i = 0; i < mathBasic<T>::row(); i++) {
delete[] element[i];
}
delete[] element;
}
c = mp.mathBasic<T>::column();
r = mp.mathBasic<T>::row();
element = new T* [r];
for (int i = 0; i < r; i++)
element[i] = new T[c]();
for (int i = 0; i < r; i++)
for (int j = 0; j < c; j++)
element[i][j] = mp.element[i][j];
return *this;
}

}

Matrix.h: In copy constructor ‘mathematic::Matrix< T

``````

::Matrix(const mathematic::Matrix&)’:
Matrix.h:6:42: error: class ‘mathematic::Matrix< T >’ does not have any field named ‘mathBasic’
Matrix< T >::Matrix(const Matrix< T > & mat):mathBasic(mat.mathBasic
^

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#### 3条回答默认 最新

• 已采纳
开水 2015-04-25 03:13

`Matrix`类里报错你贴`mathBasic`的代码上来？！这咋给你看？

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• lx624909677 2015-04-25 02:57

先去看看写模板的基本语法！！

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• xiangshudemeng 2015-04-25 03:01

模板好像不是这样写的吧

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