C++/List/list display

mem_fun_ref and print

<source lang="cpp">

1. include <algorithm>
2. include <functional>
3. include <iostream>
4. include <iterator>
5. include <list>

using namespace std; class Employee {

  public:
  Employee( const string& name = "", int sales = 0,int district = 0 );
  bool operator>( const Employee& rhs ) const;
  void print() const;
  private:
  int district_;
  string name_;
  int sales_;

}; inline Employee::Employee( const string& name, int sales,

  int district )
  : district_( district ), name_( name ), sales_( sales )

{} inline bool Employee::operator>( const Employee& rhs ) const { return sales_ > rhs.sales_; } inline void Employee::print() const { cout << name_ << " from District " << district_

  << " has sales of $" << sales_ << endl;

} int main( ) {

  list<Employee> list1;
  list1.push_back( Employee( "A", 3, 1 ) );
  list1.push_back( Employee( "B", 4, 1 ) );
  list1.push_back( Employee( "C", 8, 1 ) );
  list1.sort( greater<Employee>() );
  for_each( list1.begin(), list1.end(), mem_fun_ref( &Employee::print ) );

}

 </source>

Print all elements in a list with copy function

<source lang="cpp">

/* The following code example is taken from the book

* "The C++ Standard Library - A Tutorial and Reference"
* by Nicolai M. Josuttis, Addison-Wesley, 1999
*
* (C) Copyright Nicolai M. Josuttis 1999.
* Permission to copy, use, modify, sell and distribute this software
* is granted provided this copyright notice appears in all copies.
* This software is provided "as is" without express or implied
* warranty, and with no claim as to its suitability for any purpose.
*/

1. include <iostream>
2. include <list>
3. include <algorithm>
4. include <iterator>

using namespace std; void printLists (const list<int>& l1, const list<int>& l2) {

   cout << "list1: ";
   copy (l1.begin(), l1.end(), ostream_iterator<int>(cout," "));
   cout << endl << "list2: ";
   copy (l2.begin(), l2.end(), ostream_iterator<int>(cout," "));
   cout << endl << endl;

} int main() {

   // create two empty lists
   list<int> list1, list2;
   // fill both lists with elements
   for (int i=0; i<6; ++i) {
       list1.push_back(i);
       list2.push_front(i);
   }
   printLists(list1, list2);

}

/* 

list1: 0 1 2 3 4 5 list2: 5 4 3 2 1 0

*/       
   
 </source>

Print out each element in a list

<source lang="cpp">

/* The following code example is taken from the book

* "The C++ Standard Library - A Tutorial and Reference"
* by Nicolai M. Josuttis, Addison-Wesley, 1999
*
* (C) Copyright Nicolai M. Josuttis 1999.
* Permission to copy, use, modify, sell and distribute this software
* is granted provided this copyright notice appears in all copies.
* This software is provided "as is" without express or implied
* warranty, and with no claim as to its suitability for any purpose.
*/

1. include <iostream>
2. include <list>
3. include <algorithm>

using namespace std; /* PRINT_ELEMENTS()

* - prints optional C-string optcstr followed by
* - all elements of the collection coll
* - separated by spaces
*/

template <class T> inline void PRINT_ELEMENTS (const T& coll, const char* optcstr="") {

   typename T::const_iterator pos;
   std::cout << optcstr;
   for (pos=coll.begin(); pos!=coll.end(); ++pos) {
       std::cout << *pos << " ";
   }
   std::cout << std::endl;

}

int main() {

   list<int> coll;
   // insert elements from 1 to 9
   for (int i=1; i<=9; ++i) {
       coll.push_back(i);
   }
   PRINT_ELEMENTS(coll,"initialized:                ");

}

/* 

initialized: 1 2 3 4 5 6 7 8 9

*/       
   
 </source>

Use ostream_iterator and copy to display collection content

<source lang="cpp">

1. include <iostream>

using std::cout; using std::endl;

1. include <list>
2. include <algorithm>
3. include <iterator>

int main() {

  int array[ 4 ] = { 2, 6, 4, 8 };
  std::list< int > values;      // create list of ints
  std::list< int > otherValues; // create list of ints
  std::ostream_iterator< int > output( cout, " " );
  // insert items in values
  values.push_front( 1 );
  values.push_front( 3 );
  values.push_back( 4 );
  values.push_back( 2 );
  cout << "values contains: ";
  std::copy( values.begin(), values.end(), output );
  otherValues.insert( otherValues.begin(), array, array + 4 );
  cout << "\n\notherValues contains: ";
  std::copy( otherValues.begin(), otherValues.end(), output );

  values.merge( otherValues );
  cout << "\n\nvalues contains: ";
  std::copy( values.begin(), values.end(), output );
  cout << endl;
  return 0;

} /* values contains: 3 1 4 2 otherValues contains: 2 6 4 8 values contains: 2 3 1 4 2 6 4 8

*/
       
   
 </source>