#include
using namespace std;
template
class BigNumber {
T n;
public:
BigNumber(T i) :n(i) {}
BigNumber operator+(BigNumber b) {
return BigNumber(n + b.n);
}
};
int main() {
BigNumber b1(1), b2(2);
3 + 3;
b1 + 3;
3+b1;//这是错的,如何改成对的
b1 + b2;
return 0;
}