// Simple example showing hash_map in GCC 3.4.2
// and what the new C++ standard TR1 uses.
// http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1836.pdf

#include <iostream>
// In TR1, include <tr1/unordered_map>
#include <ext/hash_map>

using namespace std;
// In TR1, use std::tr1::unordered_map
using __gnu_cxx::hash_map;

// In TR1, use unordered_map
typedef hash_map<const char *, int> NameIntMap;

// The rest of the code is unchanged.
// Note: in GCC 3.4.2, you can't use a C++ string for a key
// until you define hash() for strings. See:
// http://gcc.gnu.org/ml/libstdc++/2002-04/msg00107.html

int main( )
{
    NameIntMap ageMap;

    ageMap["John"] = 24;
    ageMap["Mary"] = 32;
    
    cout << "Number of entries: " << ageMap.size() << endl
         << "John is " << ageMap["John"] << endl
         << "Mary is " << ageMap["Mary"] << endl;
         
    for (NameIntMap::iterator iter = ageMap.begin();
         iter != ageMap.end();
         ++iter) {
      cout << "Age of " << iter->first << " is " << iter->second << endl;
    }

    return 0;
}