#include <iostream>
#include <list>
#include <cstring>
using namespace std;
class myclass {
int a, b;
int sum;
public:
myclass() { a = b = 0; }
myclass(int i, int j) {
a = i;
b = j;
sum = a + b;
}
int getsum() { return sum; }
friend bool operator<(const myclass &o1,const myclass &o2);
friend bool operator>(const myclass &o1,const myclass &o2);
friend bool operator==(const myclass &o1,const myclass &o2);
friend bool operator!=(const myclass &o1,const myclass &o2);
};
bool operator<(const myclass &o1, const myclass &o2)
{
return o1.sum < o2.sum;
}
bool operator>(const myclass &o1, const myclass &o2)
{
return o1.sum > o2.sum;
}
bool operator==(const myclass &o1, const myclass &o2)
{
return o1.sum == o2.sum;
}
bool operator!=(const myclass &o1, const myclass &o2)
{
return o1.sum != o2.sum;
}
int main()
{
int i;
list<myclass> lst1;
for(i=0; i<10; i++) lst1.push_back(myclass(i, i));
list<myclass>::iterator p = lst1.begin();
while(p != lst1.end()) {
cout << p->getsum() << endl;
p++;
}
list<myclass> lst2;
for(i=0; i<10; i++) lst2.push_back(myclass(i*2, i*3));
p = lst2.begin();
while(p != lst2.end()) {
cout << p->getsum() << endl;
p++;
}
// now, merget lst1 and lst2
lst1.merge(lst2);
p = lst1.begin();
while(p != lst1.end()) {
cout << p->getsum() << " ";
p++;
}
return 0;
}
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