C++/List/list splice
Содержание
Insert all elements of list1 before the first element with value 3 of list2
/* 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.
*/
#include <iostream>
#include <list>
#include <algorithm>
#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);
}
/*
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
*/
List Splice
#include <list>
#include <string>
#include <iostream>
using namespace std;
int main(int argc, char** argv)
{
list<string> dictionary, bWords;
dictionary.push_back("A");
dictionary.push_back("B");
dictionary.push_back("C");
dictionary.push_back("D");
dictionary.push_back("E");
dictionary.push_back("F");
bWords.push_back("G");
bWords.push_back("H");
bWords.push_back("I");
list<string>::iterator it;
int i;
for (it = dictionary.begin(), i = 0; i < 3; ++it, ++i);
dictionary.splice(it, bWords);
for (it = dictionary.begin(); it != dictionary.end(); ++it) {
cout << *it << endl;
}
return (0);
}
Move first element to the end
/* 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.
*/
#include <iostream>
#include <list>
#include <algorithm>
#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);
}
/*
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
*/
Use list.splice() to remove elements in a list and insert at end of values
#include <iostream>
using std::cout;
using std::endl;
#include <list> // list class-template definition
#include <algorithm> // copy algorithm
#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;
}
/*
values contains: 3 1 4 2
values contains: 3 1 4 2 2 6 4 8
*/