Why am I getting linker errors when trying to compile this code, this is basically a code for a template class matrix that is complex & matrix is a square matrix so if size "3" is entered it means a matrix of [3][3] but somehow it gives me errors, any help?
#include <iostream>
#include <iomanip>
using namespace std;
template <class T>
class matrix
{
private:
T** real;
T** imag;
int size;
public:
matrix(int = 0);
friend ostream& operator<<(ostream& out, matrix<T>);
};
// constructor
template <class T>
matrix<T>::matrix(int length)
{
size = length;
real = new T*[size];
for (int i = 0; i < size; i++)
real[i] = new T[size];
imag = new T*[size];
for (int i = 0; i < size; i++)
imag[i] = new T[size];
cout << "Enter real elements of matrix: ";
for (int i = 0; i < size; i++)
for (int j = 0; j < size; j++)
cin >> real[i][j];
cout << "Enter imag elements of matrix: ";
for (int i = 0; i < size; i++)
for (int j = 0; j < size; j++)
cin >> imag[i][j];
}
// functions defined here
template <class T>
ostream& operator<<(ostream& out, matrix<T> arg)
{
out << showpos;
for (int i = 0; i < arg.size; i++)
for (int j = 0; j < arg.size; j++)
out << arg.real[i][j] << arg.imag[i][j] << " ";
out << endl;
return out;
}
int main()
{
matrix <int> obj1(3);
cout << obj1;
}
Thank you everyone for help. seems like i needed the template because it was a non-member function of class matrix, following is the correct code. Sorry if I've done anything wrong while posting this question because in-fact this is first time I'm using stack overflow.
#include <iostream>
#include <iomanip>
#include <cstdlib>
using namespace std;
// Class !
template <class T> class matrix
{
private:
T** real;
T** imag;
int size;
public:
matrix(int = 0);
matrix(int,int);
template <class T> friend ostream& operator<< <T>(ostream& out, matrix<T>);
matrix operator+(matrix);
matrix operator-(matrix);
};
// Constructor !
template <class T> matrix<T>::matrix(int lenght, int dummy)
{
size = lenght;
real = new T*[size];
for (int i = 0; i < size; i++)
real[i] = new T[size];
imag = new T*[size];
for (int i = 0; i < size; i++)
imag[i] = new T[size];
}
template <class T> matrix<T>::matrix(int length)
{
size = length;
real = new T*[size];
for (int i = 0; i < size; i++)
real[i] = new T[size];
imag = new T*[size];
for (int i = 0; i < size; i++)
imag[i] = new T[size];
cout << "Enter real elements of matrix >> \n";
for (int i = 0; i < size; i++)
for (int j = 0; j < size; j++)
cin >> real[i][j];
cout << "Enter imag elements of matrix: >> \n";
for (int i = 0; i < size; i++)
for (int j = 0; j < size; j++)
cin >> imag[i][j];
}
// Main()
int main()
{
int size;
cout << "Enter Size: ";
cin >> size;
cout << "\nMatrix A created !" << endl;
matrix <int> A(size);
cout << "\nMatrix B created !" << endl;
matrix <int> B(size);
system("cls");
cout << "Matrix A" << endl;
cout << A;
cout << "\nMatrix B" << endl;
cout << B;
cout << "\nMatrix A + B" << endl;
cout << A + B;
cout << "\nMatrix A - B" << endl;
cout << A - B;
}
// Functions !
template <class T> ostream& operator<<(ostream& out, matrix<T> arg)
{
out << showpos;
for (int i = 0; i < arg.size; i++)
{
for (int j = 0; j < arg.size; j++)
{
out << arg.real[i][j] << arg.imag[i][j] << "i ";
}
out << endl;
}
return out;
}
template <class T> matrix<T> matrix<T>::operator+(matrix arg)
{
matrix<T> temp(size,0); // 0 is a inserted as dummy because I've overloaded
constructor of class
for (int i = 0; i < size; i++)
{
for (int j = 0; j < size; j++)
{
temp.real[i][j] = real[i][j] + arg.real[i][j];
temp.imag[i][j] = imag[i][j] + arg.imag[i][j];
}
}
return temp;
}
template <class T> matrix<T> matrix<T>::operator-(matrix arg)
{
matrix<T> temp(size, 0); // 0 is a inserted as dummy because I've overloaded
constructor of class
for (int i = 0; i < size; i++)
{
for (int j = 0; j < size; j++)
{
temp.real[i][j] = real[i][j] - arg.real[i][j];
temp.imag[i][j] = imag[i][j] - arg.imag[i][j];
}
}
return temp;
}