std::back_insert_iterator
Defined in header <iterator> | ||
|---|---|---|
template< class Container >
class back_insert_iterator
: public std::iterator<std::output_iterator_tag, void, void, void, void>
| (until C++17) | |
template< class Container > class back_insert_iterator; | (since C++17) |
std::back_insert_iterator is a LegacyOutputIterator that appends elements 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 type | Definition | ||||
|---|---|---|---|---|---|
iterator_category | std::output_iterator_tag | ||||
value_type | void | ||||
difference_type |
|
||||
pointer | void | ||||
reference | void | ||||
container_type |
Container |
| Member types | (until C++17) |
Member functions
constructs a new back_insert_iterator (public member function) |
|
| inserts an object into the associated container (public member function) |
|
| no-op (public member function) |
|
| no-op (public member function) |
Member objects
| Member name | Definition |
|---|---|
container (protected) | a pointer of type Container* |
Example
#include <algorithm>
#include <iostream>
#include <iterator>
#include <vector>
int main()
{
std::vector<int> v;
std::generate_n(
std::back_insert_iterator<std::vector<int>>(v),
// Or use std::back_inserter helper
// Or use std::back_insert_iterator(v) C++17's syntax
10,
[n = 0]() mutable { return ++n; }
);
for (int n : v)
std::cout << n << ' ';
std::cout << '\n';
}
Output:
1 2 3 4 5 6 7 8 9 10
See also
creates a std::back_insert_iterator of type inferred from the argument (function template) |
|
| iterator adaptor for insertion at the front of a container (class template) |
|
| iterator adaptor for insertion into a container (class template) |
© cppreference.com
Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
https://en.cppreference.com/cpp/iterator/back_insert_iterator
