#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()
{
list<MyClass> lst1;
for(int i=0; i<10; i++) lst1.push_back(MyClass(i, i));
cout << "First list: ";
list<MyClass>::iterator p = lst1.begin();
while(p != lst1.end()) {
cout << p->getsum() << " ";
p++;
}
cout << endl;
// create a second list
list<MyClass> lst2;
for(int i=0; i<10; i++) lst2.push_back(MyClass(i*2, i*3));
cout << "Second list: ";
p = lst2.begin();
while(p != lst2.end()) {
cout << p->getsum() << " ";
p++;
}
cout << endl;
lst1.merge(lst2);
cout << "Merged list: ";
p = lst1.begin();
while(p != lst1.end()) {
cout << p->getsum() << " ";
p++;
}
return 0;
}
/*
First list: 0 2 4 6 8 10 12 14 16 18
Second list: 0 5 10 15 20 25 30 35 40 45
Merged list: 0 0 2 4 5 6 8 10 10 12 14 15 16 18 20 25 30 35 40 45
*/
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