Difference between revisions of "cpp/iterator/back inserter"
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std::back_insert_iterator<Container> back_inserter( Container& c ); | std::back_insert_iterator<Container> back_inserter( Container& c ); | ||
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{{tt|back_inserter}} is a convenient function template that constructs a {{lc|std::back_insert_iterator}} for the container {{c|c}} with the type deduced from the type of the argument. | {{tt|back_inserter}} is a convenient function template that constructs a {{lc|std::back_insert_iterator}} for the container {{c|c}} with the type deduced from the type of the argument. | ||
Revision as of 08:23, 18 September 2023
| Defined in header <iterator>
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| template< class Container > std::back_insert_iterator<Container> back_inserter( Container& c ); |
(constexpr since C++20) | |
back_inserter is a convenient function template that constructs a std::back_insert_iterator for the container c with the type deduced from the type of the argument.
Contents |
Parameters
| c | - | container that supports a push_back operation
|
Return value
A std::back_insert_iterator which can be used to add elements to the end of the container c.
Possible implementation
template<class Container> std::back_insert_iterator<Container> back_inserter(Container& c) { return std::back_insert_iterator<Container>(c); } |
Example
Run this code
#include <algorithm> #include <iostream> #include <iterator> #include <vector> int main() { std::vector<int> v{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}; std::fill_n(std::back_inserter(v), 3, -1); for (int n : v) std::cout << n << ' '; std::cout << '\n'; }
Output:
1 2 3 4 5 6 7 8 9 10 -1 -1 -1
See also
| iterator adaptor for insertion at the end of a container (class template) | |
| creates a std::front_insert_iterator of type inferred from the argument (function template) | |
| creates a std::insert_iterator of type inferred from the argument (function template) |
