0
Compiler: MSVC

So I am trying to implement my own number system that can store infinite numbers in C++. What I did was overload operator<< for my custom class BigInt as such:

inline std::ostream& operator<<(std::ostream& os, BigInt& bint)
{
    os << bint.num; // num is a std::string
    return os;
}

Now I implemented addition for my custom numbers:

inline BigInt& operator+(BigInt& bint1, BigInt& bint2)
{
    BigInt sum;

    // addition code...

    return sum;
}

Now when I try to print a BigInt like this:

BigInt bint1("123");
std::cout << bint1;

..it works. But nothing prints out when I do this:

BigInt bint1("123"), bint2("456");
std::cout << bint1 + bint2;

I suspect some sort of UB here. What am I doing wrong here?

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