#include<vector>
#include<iostream>

/* This is a quick file to demonstrate how implicit construction
 * and friend operators work.
 * If you have operator== as a member function, then this won't compile.
 * If you have the non-member "friend", though, it works!
 *
 * I guess this also demos preprocessor directives...
 * oops?
 */

//#define _POLY_FRIEND_

using namespace std;

class poly {
public:
    poly(int x): c(1) {c[0]=x;}
    #ifdef _POLY_FRIEND_
    friend bool operator==(const poly&, const poly&);
    #else
    bool operator==(const poly& p) const {
        return c == p.c;
    }
    #endif
private:
    vector<int> c;
};

#ifdef _POLY_FRIEND_
bool operator==(const poly& p, const poly& q) {
    return p.c == q.c;
}
#endif

int main(int argc, char* argv[]) {
    poly p = 1;
    cout << (1 == p) << endl;
}