Storing pointers in a set - C++ STL

C++ examples for STL:set

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Description

Storing pointers in a set

Demo Code

#include <iostream>
#include <set>
#include <string>
#include <functional>
#include <cassert>

using namespace std;

// Class for comparing strings given two string pointers
struct strPtrLess {
   bool operator()(const string* p1, const string* p2) {
      assert(p1 && p2);/*w  w  w .j a  va 2 s .  c o m*/
      return(*p1 < *p2);
   }
};

int main() {
   set<string*, strPtrLess> setStrPtr;  // Give it my special 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;  // Dereference the iterator and what it points to
}

Result


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