Question

everyone:

Im creating a program that is able to create Matrices and and perform various operations on them for a course at school. They require us to overload the operators with with the appropriate Matrix Operations.

I am having a hard time with the following function:

typedef double matrixType;


using namespace std;


class Matrix{
protected:
    int m,n; // m:row size n:column size
    matrixType **a; //Allows us to acces the a(ij) i,j position of the matrix


//==================================================
// (==Operator)Verifies if two given Matrices are equal
//==================================================

bool Matrix::operator==(const Matrix &B){

bool flag=false;


if(B.m ==m && B.n ==n){

    for (int row=0; row<m; row++) {
        for (int col=0; col<n; col++) {
            if (B[row][col] != a[row][col]) {
                flag=false;
            }
        }
    }
    flag= true;
}

else{
    flag=false;

}

return flag;


}

Xcode warns me that at the following line:

 if (B[row][col] != a[row][col])

type ‘const Matrix’ doesn’t provide a subscript operator

Note: Function Headers,constructors and other functions have been omitted from this code portion.

Any help would be greatly appreciated.
Thank you.

Answer 1

Given your implementation, it should be if (B.a[row][col] != a[row][col])

BTW: You should read this page if you plan to implement your own matrix class.