Mega Code Archive
Insert_iterator
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/* 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 <set>
#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()
{
set<int> coll;
// create insert iterator for coll
// - inconvenient way
insert_iterator<set<int> > iter(coll,coll.begin());
// insert elements with the usual iterator interface
*iter = 1;
iter++;
*iter = 2;
iter++;
*iter = 3;
PRINT_ELEMENTS(coll,"set: ");
// create inserter and insert elements
// - convenient way
inserter(coll,coll.end()) = 44;
inserter(coll,coll.end()) = 55;
PRINT_ELEMENTS(coll,"set: ");
// use inserter to insert all elements into a list
list<int> coll2;
copy (coll.begin(), coll.end(), // source
inserter(coll2,coll2.begin())); // destination
PRINT_ELEMENTS(coll2,"list: ");
// use inserter to reinsert all elements into the list before the second el
ement
copy (coll.begin(), coll.end(), // source
inserter(coll2,++coll2.begin())); // destination
PRINT_ELEMENTS(coll2,"list: ");
}
set: 1 2 3
set: 1 2 3 44 55
list: 1 2 3 44 55
list: 1 1 2 3 44 55 2 3 44 55
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