#include <iostream>
#include <string>
#include <functional>

#include "either.hxx"

using std::cout;
using std::endl;

using std::string;
using std::function;

int main() {
    function<either<string,int>(int)> f = [] (int x) {
        if (x ==  2) { return either<string,int>::left("Cannot deal with  2."); }
        if (x == 12) { return either<string,int>::left("Cannot deal with 12."); }
        return either<string,int>::right(x*2);
    };
    cout << (((Return<string,int>(3) >>= f) >>= f) >>= f) << endl;
    // -> <Left:Cannot deal with 12.>
    cout << (((Return<string,int>(4) >>= f) >>= f) >>= f) << endl;
    // -> <Right:32>
    return 0;
}