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std::insert_iterator

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< cpp‎ | iterator
Revision as of 21:08, 25 June 2013 by P12 (Talk | contribs)

Defined in header <iterator>
template< class Container >

class insert_iterator : public std::iterator< std::output_iterator_tag,

                                              void,void,void,void >

std::insert_iterator is an output iterator that inserts elements into a container for which it was constructed, at the position pointed to by the supplied iterator. The container's insert() member function is called whenever the iterator (whether dereferenced or not) is assigned to. Incrementing the std::insert_iterator is a no-op.

Contents

Member types

Member type Definition
container_type Container

Member functions

constructs a new insert_iterator
(public member function) [edit]
inserts an object into the associated container
(public member function) [edit]
no-op
(public member function) [edit]
no-op
(public member function) [edit]

Member objects

Member name Definition
container (protected) a pointer of type Container*
iter (protected) an iterator of type Container::iterator

Inherited from std::iterator

Member types

Member type Definition
value_type void
difference_type void
pointer void
reference void
iterator_category std::output_iterator_tag

Example

#include <vector>
#include <list>
#include <iostream>
#include <iterator>
#include <algorithm>
int main()
{
    std::vector<int> v{1,2,3,4,5};
    std::list<int> l{-1,-2,-3};
    std::copy(v.begin(), v.end(), // may be simplified with std::inserter
              std::insert_iterator<std::list<int>>(l, std::next(l.begin()))); 
    for(int n : l)
        std::cout << n << ' ';
    std::cout << '\n';
}

Output:

-1 1 2 3 4 5 -2 -3

See also

creates a std::insert_iterator of type inferred from the argument
(function template) [edit]
iterator adaptor for insertion at the end of a container
(class template) [edit]
iterator adaptor for insertion at the front of a container
(class template) [edit]