operation overloading in c++ You should also support stream insertion (similar t

Question

operation overloading in c++

You should also support stream insertion (similar to overriding the toString method in Java) so that your matrices can easily be printed.

cout << a << endl;

// example output: [ 1, 2 ]

// [ 1, 3 ]

You should also support matrix assignment using an initializer list (to easily overwrite existing elements) that looks like the following:

Matrix d(2, 2);

d = {{ 1, 2 },

{ 3, 4 }};

In order to support this last operator overload (i.e., matrix assignment using an initializer list), you will need to use a standard template library (STL) class called std::initializer list. The type signature for the << parameter representing the list should be std::initializer list> or simply i list if you use the provided typedef. It is preferred that you specify the parameter as a const i list & in order to avoid any unnecessary copying.

• Overloaded Function Call Operator (operator()(uint row, uint col)): After creating a (non-dynamically allocated) Matrix object, the user should be able to access the elements using the function call operator (as an alternative to using the at function):

Matrix a(1, 1);

a(0, 0) = 5;

cout << a(0,0) << endl;

(should print out 5).

Overloaded Non-Member Arithmetic Operators for Scalers: You should have already created overloads to support the basic arithmetic operations where the right-hand-side of an operation is a scaler value. Now you need to implement operator overloads so that scalers can be used on the left-hand-side of an operation. Here is an example showing the operators that you need to support:

Matrix a = {{1, 2}, {3, 4}};

Matrix b = 4.0 + a; // [ 5, 6 ]

// [ 7, 8 ]

Matrix c = 4.0 - a; // [ 3, 2 ]

// [ 1, 0 ]

Matrix d = 2.0 * a; // [ 2, 4 ]

// [ 6, 8 ]

Matrix e = 12.0 / a; // [ 12, 6 ] [ 4, 3 ]

Explanation / Answer

struct Matrix {
    static int const row = 2, col = 2;
    int A[ row][col];
};

istream &operator>>(istream &in, Matrix &m)
{
   for (int i = 0; i < m.row; ++i)    {
       for (int j = 0; j < m.col; ++j)
           if ( ! (in >> m.A[i][j]) ) return in;
}
return in;
}
ostream &operator<<(ostream &out, const Matrix &m)
{
    for (int i = 0; i < m.row; ++i)    {
        for (int j = 0; j < m.col; ++j)
            out << m.A[i][j] << " ";
        out << endl;
    }
    return out;
}
int main() {
    Matrix M;
    cin >> M;
    cout << M;
}

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