std::back_insert_iterator

template< class Container >
class back_insert_iterator : public std::iterator< std::output_iterator_tag,
                                                   void, void, void, void >

template< class Container >
class back_insert_iterator;

std::back_insert_iterator is an OutputIterator that appends to a container for which it was constructed. The container's push_back() member function is called whenever the iterator (whether dereferenced or not) is assigned to. Incrementing the std::back_insert_iterator is a no-op.

Member types

Member functions

Member objects

Member types

Note: before C++17, these member types are required to be obtained by inheriting from std::iterator<std::output_iterator_tag,void,void,void,void>.

Example

#include <iostream>
#include <iterator>
#include <algorithm>
#include <cstdlib>
#include <vector>
 
int main()
{
    std::vector<int> v;
    std::generate_n(std::back_insert_iterator<std::vector<int>>(v), // can be simplified
                    10, [](){ return std::rand() % 10; });        // with std::back_inserter
    for (int n : v)
        std::cout << n << ' ';
    std::cout << '\n';
}

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See also