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#include <iostream>
#include <set>
#include <string>
#include <functional>
#include <cassert>
using namespace std;
struct strPtrLess {
bool operator( )(const string* p1,const string* p2) {
return(*p1 < *p2);
}
};
int main( ) {
set<string*, strPtrLess> setStrPtr; // less-than functor
string s1 = "T";
string s2 = "D";
string s3 = "H";
setStrPtr.insert(&s1);
setStrPtr.insert(&s2);
setStrPtr.insert(&s3);
for (set<string*, strPtrLess>::const_iterator p = setStrPtr.begin( ); p != setStrPtr.end( ); ++p)
cout << **p << endl;
}
/*
D
H
T
*/
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