Matrice sabiranje, mnozenje sa bacanjem izuzetka

#include <iostream>
#include <vector>
#include <iomanip>
#include <stdexcept>

int BrojKolona(std::vector<std::vector<int>> Mat)
{
    return Mat[0].size();
}

int BrojRedova(std::vector<std::vector<int>> Mat)
{
    return Mat.size();
}

void IspisiMatricu(std::vector<std::vector<int>> Mat)
{
    for(int i(0); i < BrojRedova(Mat); i++)
    {
        for(int j(0); j < BrojKolona(Mat); j++)
            std::cout << std::setw(5) << Mat[i][j];
        std::cout << std::endl;
    }
}

std::vector<std::vector<int>> KreirajMatricu(int br_redova, int br_kolona)
{
    return std::vector<std::vector<int>>(br_redova, std::vector<int>(br_kolona));
}

std::vector<std::vector<int>> UnesiMatricu(int br_redova, int br_kolona)
{
    std::vector<std::vector<int>> mat(KreirajMatricu(br_redova, br_kolona));
    for(int i(0); i < br_redova; i++)
        for(int j(0); j < br_kolona; j++)
        {
            std::cout << "Unesite element (" << i+1 << "," << j+1 << "): ";
            std::cin >> mat[i][j];
        }
    return mat;
}

std::vector<std::vector<int>> SaberiMatrice(std::vector<std::vector<int>> Mat1, std::vector<std::vector<int>> Mat2)
{
    if((BrojRedova(Mat1) != BrojRedova(Mat2)) || (BrojKolona(Mat1) != BrojKolona(Mat2))) throw std::domain_error("Matrice nisu saglasne za sabiranje!");
    std::vector<std::vector<int>> Mat3(KreirajMatricu(BrojRedova(Mat1), BrojKolona(Mat1)));
    for(int i(0); i < BrojRedova(Mat3); i++)
        for(int j(0); j < BrojKolona(Mat3); j++)
            Mat3[i][j] = Mat1[i][j]+Mat2[i][j];
    return Mat3;
}

std::vector<std::vector<int>> PomnoziMatrice(std::vector<std::vector<int>> Mat1, std::vector<std::vector<int>> Mat2)
{
    if(BrojKolona(Mat1) != BrojRedova(Mat2)) throw std::domain_error("Matrice nisu saglasne za mnozenje!");
    std::vector<std::vector<int>> Mat3(KreirajMatricu(BrojRedova(Mat1), BrojKolona(Mat2)));
    for(int i(0); i < BrojRedova(Mat3); i++)
        for(int j(0); j < BrojKolona(Mat3); j++)
        {
            int suma(0);
            for(int k(0); k < BrojRedova(Mat3); k++)
                suma+=Mat1[i][k]*Mat2[k][j];
            Mat3[i][j] = suma;
        }
    return Mat3;
}

int main()
{
    try
    {
        int br_redova1(3), br_kolona1(3), br_redova2(3), br_kolona2(3);
        std::vector<std::vector<int>> Mat1(KreirajMatricu(br_redova1, br_kolona1));
        std::vector<std::vector<int>> Mat2(KreirajMatricu(br_redova2, br_kolona2));
        Mat1 = UnesiMatricu(br_redova1, br_kolona1);
        Mat2 = UnesiMatricu(br_redova2, br_kolona2);
        IspisiMatricu(SaberiMatrice(Mat1, Mat2));
        std::cout << std::endl;
        IspisiMatricu(PomnoziMatrice(Mat1, Mat2));
    }
    catch(std::domain_error izuzetak)
    {
        std::cout << izuzetak.what() << std::endl;
    }
    return 0;
}