C++ Tutorial/list/list splice

Insert all elements of list1 before the first element with value 3 of list2

<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);
   // insert all elements of list1 before the first element with value 3 of list2
   // - find() returns an iterator to the first element with value 3
   list2.splice(find(list2.begin(),list2.end(),  // destination position
                     3),
                list1);                          // source list
   printLists(list1, list2);

}</source>

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

Move first element to the end

<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);
   // move first element to the end
   list2.splice(list2.end(),        // destination position
                list2,              // source list
                list2.begin());     // source position
   printLists(list1, list2);

}</source>

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

splice one list into another

<source lang="cpp">#include <iostream>

1. include <list>

using namespace std; void show(const char *msg, list<char> lst); int main() {

 list<char> lstA;
 list<char> lstB;
 lstA.push_back("A");
 lstA.push_back("F");
 lstA.push_back("B");
 lstA.push_back("R");
 lstB.push_back("X");
 lstB.push_back("A");
 lstB.push_back("F");
 lstA.sort();
 lstB.sort();
 // Now, splice lstB into lstA.
 list<char>::iterator itr = lstA.begin();
 ++itr;
 lstA.splice(itr, lstB);
 show("lstA after splice: ", lstA);
 cout << endl;
 return 0;

} void show(const char *msg, list<char> lst) {

 list<char>::iterator itr;
 cout << msg << endl;
 for(itr = lst.begin(); itr != lst.end(); ++itr)
   cout << *itr << endl;

}</source>

Use list.splice() to remove elements in a list and insert at end of values

<source lang="cpp">#include <iostream> using std::cout; using std::endl;

1. include <list> // list class-template definition
2. include <algorithm> // copy algorithm
3. include <iterator> // ostream_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 );
  values.splice( values.end(), otherValues );
  cout << "\n\nvalues contains: ";
  std::copy( values.begin(), values.end(), output );
  cout << endl;
  return 0;

}</source>

values contains: 3 1 4 2
values contains: 3 1 4 2 2 6 4 8