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我在運行此代碼時遇到問題。它應該是一個帶有構造函數，析構函數，複製構造函數和運算符重載的模板化二維數組。C++操作符重載<<錯誤。 SafeMatrix 2D陣列
我的主要問題是在導致錯誤的ostream& operator<<(ostream& os, SafeMatrix<class T> s) overloader。主要，當我cout<<b[0][0]，它打印罰款，但是當我在ostream& operator<<(ostream& os, SafeMatrix<class T> s) overloader中，我得到錯誤。我正在試圖打印像cout << b這樣的對象，就像你在main中看到的一樣。
可能存在很多編碼錯誤。對不起，我是模板和重載的新手。我一直在閱讀和閱讀，無法找到與我的項目相關的任何內容。
#include <iostream>
#include <cstdlib>
#include <cassert>
using namespace std;
template <class T> class SafeMatrix{
private:
int row_low, row_high, col_low, col_high;
T** p;
public:
// default constructor
// allows for writing things like SafeMatrix a;
SafeMatrix() : row_low(0), row_high(-1)
, col_low(0), col_high(-1), p(nullptr){ }
// 1 parameter constructor
// SafeMatrix (10);
SafeMatrix(int dim){
if (dim <= 0){
cout << "constructor error in bounds definition" << endl;
exit(1);
}
row_low = 0; row_high = dim - 1;
col_low = 0; col_high = dim - 1;
p = new T*[dim];
for (int i = 0; i < dim; i++)
p[i] = new T[dim];
}
// 2 parameter constructor lets us write
// SafeMatrix (10,20);
SafeMatrix(int row, int col){
if (row <= 0 || col<=0){
cout << "constructor error in bounds definition" << endl;
exit(1);
}
row_low = 0; row_high = row - 1;
col_low = 0; col_high = col - 1;
p = new T*[row];
for (int i = 0; i < row; i++)
p[i] = new T[col];
}
// 2 parameter constructor lets us write
// SafeMatrix (10,20);
SafeMatrix(int row_low, int row_high, int col_low, int col_high){
if ((row_high - row_low + 1) <= 0 || (col_high - col_low + 1) <= 0){
cout << "constructor error in bounds definition" << endl;
exit(1);
}
this.row_low = row_low; this.row_high = row_high - 1;
this.col_low = col_low; this.col_high = col_high - 1;
p = new T*[(col_high - col_low) + 1];
for (int i = 0; i <= row_high-row_low; i++)
p[i] = new T[(col_high - col_low) + 1];
}
// copy constructor for pass by value and
// initialization
SafeMatrix(const SafeMatrix &s){
int row = (s.row_high - s.row_low) + 1,
col = (s.col_high - s.col_low) + 1;
p = new T*[row];
for (int i = 0; i < row; i++)
p[i] = new T[col];
for (int i = 0; i < row; i++)
for (int j = 0; j < col;j++)
p[i][j] = s.p[i][j];
row_low = s.row_low; row_high = s.row_high;
col_low = s.col_low; col_high = s.col_high;
}
// destructor
~SafeMatrix(){
for (int i = 0; i < (row_high - row_low) + 1; i++)
delete[] p[i];
delete[] p;
}
friend class Brackets;
//overloaded [] lets us write
//SafeMatrix x(10,20); x[15]= 100;
class Brackets {
private:
T* p1;
public:
Brackets(T* p2) : p1(p2) { }
T& operator[](int i) {
/*if (i<col_low || i>col_high) {
cout << "index " << i << " out of range" << endl;
exit(1);
}*/
return p1[i];
}
};
Brackets operator[](int i) {
if (i<row_low || i>row_high) {
cout << "index " << i << " out of range" << endl;
system("pause");
exit(1);
}
return Brackets(p[i]);
}
// overloaded assignment lets us assign
// one SafeMatrix to another
SafeMatrix& operator=(const SafeMatrix & s){
if (this != &s){
delete[] p;
int row = (s.row_high - s.row_low) + 1,
col = (s.col_high - s.col_low) + 1;
p = new T*[row];
for (int i = 0; i < col; i++)
p[i] = new T[col];
for (int i = 0; i < row; i++)
for (int j = 0; j < col; j++)
p[i][j] = s.p[i][j];
this.row_low = s.row_low; this.row_high = s.row_high;
this.col_low = s.col_low; this.col_high = s.col_high;
}
return *this;
}
// overloads << so we can directly print SafeMatrix
friend ostream& operator<<(ostream& os, const SafeMatrix<T> s);
};
ostream& operator<<(ostream& os, SafeMatrix<class T> s){
int row = (s.row_high - s.row_low) + 1,
col = (s.col_high - s.col_low) + 1;
for (int i = 0; i < row; i++){
for (int j = 0; j < col; j++){
cout << *((s.p+i)+j) << " ";
}
cout << endl;
}
return os;
};
int main(){
SafeMatrix<int> b(3, 5);
b[2][0] = 3;
cout << b[2][0] <<endl;
int counter = 0;
for (int i = 0; i<3; i++)
for (int j = 0; j < 5; j++)
b[i][j] = ++counter;
cout << "printing b the first time" <<endl;
cout << b << endl;
cout << "printing using []" << endl;
for (int i = 0; i < 3; i++){
for (int j = 0; j < 5; j++){
cout << b[i][j] << " ";
}
cout << endl;
}
}
我得到的錯誤是有點瘋狂，但在這裏，他們是：
error LNK2019: unresolved external symbol "class std::basic_ostream<char,struct std::char_traits<char> > & __cdecl operator<<(class std::basic_ostream<char,struct std::char_traits<char> > &,class SafeMatrix<int>)" ([email protected][email protected][email protected]@[email protected]@@[email protected]@[email protected][email protected]@@@Z) referenced in function _main D:\OneDrive\VS\SafeMatrix\matrix.obj SafeMatrix
和
error LNK1120: 1 unresolved externals D:\OneDrive\VS\SafeMatrix\Debug\SafeMatrix.exe 1 1 SafeMatrix
和這樣的警告：
Warning 1 warning C4150: deletion of pointer to incomplete type 'T'; no destructor called d:\onedrive\vs\safematrix\matrix.cpp 82 1 SafeMatrix
不知道這些是什麼意思。
什麼是你看到的錯誤？ – user35443
@ user35443我添加了錯誤。預先感謝您的任何幫助。 – fanterrific