#include <list>

#include <iostream>

#include <iterator>

#include <algorithm>

#include <string>

#include <boost/iterator/transform_iterator.hpp>

using namespace std;

using namespace boost;

struct personnel_record

{

personnel_record(string n, int id) : m_name(n), m_ID(id) {}

string m_name;

int m_ID;

};

struct select_name

{

typedef personnel_record argument_type;

typedef string const& result_type;

const string& operator()(const personnel_record& r) const

{

return r.m_name;

}

string& operator()(personnel_record& r) const

{

return r.m_name;

}

};

struct select_ID

{

typedef personnel_record argument_type;

typedef int& result_type;

const int& operator()(const personnel_record& r) const

{

return r.m_ID;

}

int& operator()(personnel_record& r) const

{

return r.m_ID;

}

};

ostream_iterator<string> sout(cout, "\n");

ostream_iterator<int> iout(cout, "\n");

int main(int, char*[])

{

list<personnel_record> personnel_list;

personnel_list.push_back(personnel_record("Barney", 13423));

personnel_list.push_back(personnel_record("Fred", 12343));

personnel_list.push_back(personnel_record("Wilma", 62454));

personnel_list.push_back(personnel_record("Betty", 20490));

// Example of using transform_iterator to print out the names in the

// personnel list using a projection.

transform_iterator<select_name , list<personnel_record>::iterator>

personnel_first(personnel_list.begin()),

personnel_last (personnel_list.end());

copy(personnel_first, personnel_last, sout);

cout << endl;

// Example of using transform_iterator with const_iterators to

// assign new ID numbers to the personnel.

transform_iterator<select_ID, list<personnel_record>::iterator>

ID_first(personnel_list.begin()),

ID_last(personnel_list.end());

int new_id = 0;

while (ID_first != ID_last) {

*ID_first = new_id++;

++ID_first;

}

transform_iterator<select_ID, list<personnel_record>::const_iterator, int const& >

const_ID_first(personnel_list.begin()),

const_ID_last(personnel_list.end());

copy(const_ID_first, const_ID_last, iout);

cout << endl;

cout << endl;

copy(make_transform_iterator<select_name>(personnel_list.begin()) ,

make_transform_iterator<select_name>(personnel_list.end()) ,

sout);

return 0;

}