C++ Tutorial/list/list display
Версия от 17:21, 25 мая 2010; (обсуждение)
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. */
- 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);
}</source>
list1: 0 1 2 3 4 5 list2: 5 4 3 2 1 0
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. */
- include <iostream>
- include <list>
- 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: ");
}</source>
initialized: 1 2 3 4 5 6 7 8 9
Use ostream_iterator and copy to display collection content
<source lang="cpp">#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 ); 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;
}</source>
values contains: 3 1 4 2 otherValues contains: 2 6 4 8 values contains: 2 3 1 4 2 6 4 8