Thread: Operator Problem

Hello

Is there a way to perform mathematical operations with the following custom datatype:

Code:

#include <iostream>
#include <string>
#include <vector>
#include <boost/variant.hpp>
#include <boost/lexical_cast.hpp>
using namespace std;

typedef boost::variant< int, string > IntStr;

int main()
{
    //Pre-operation is legal
    IntStr a = 1 + 2; //a = 1+2
    cout << a; //outputs 3
    cout << endl;
    
    //Post-operation is illegal
    IntStr b = 1; //b = 1
    cout << b + 2; //outputs error
    cout << endl;
}

Error:
no match for 'operator+' in 'b + 2'


Note:
candidates are: std::_Bit_iterator std:: operator+(ptrdiff_t, const std::_Bit_iterator&)
std::_Bit_const_iterator std:: operator+(ptrdiff_t, const std::_Bit_const_iterator&)

Thanks