///////////////////////////////////////////////////////////////////
//  pair.cpp - demonstrate use of pair type from STL <utility>   //
//                                                               //
//  Jim Fawcett, CSE687 - Object Oriented Design, Spring 2001    //
///////////////////////////////////////////////////////////////////

#include <utility>
#include <string>
#include <iostream>
#include <sstream>
using namespace std;

//----< create string representation of template type >--------

template <class Elem>
string formatElement(Elem &elem) {

  string retString;
  if(typeid(Elem) == typeid(string)) {
    retString = "\"";
    retString += elem;
    retString += "\"";
    return retString;
  }
  ostringstream retStream;
  retStream << elem;
  return retStream.str();
}

//----< create string representation of pair >-----------------

template <class left, class right>
string format(const pair<left,right> &pr) {

  string retStr = "pair<";
  retStr += formatElement(pr.first);
  retStr += " : ";
  retStr += formatElement(pr.second);
  retStr += ">";
  return retStr;
}

//----< test pair operations >---------------------------------

void main() {

  cout << "\n  Demonstrate use of pair type "
       << "\n ==============================\n";

  pair<string,int> psi("string argument",-7);
  cout << "\n  " << format(psi);
  
  pair<double,string> pds(3.1415927,"another string argument");
  cout << "\n  " << format(pds);

  cout << "\n\n";
}