std::front_insert_iterator
From cppreference.com
| Defined in header <iterator>
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| template< class Container > class front_insert_iterator : public std::iterator< std::output_iterator_tag, |
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std::front_insert_iterator is an OutputIterator that prepends elements to a container for which it was constructed. The container's push_front() member function is called whenever the iterator (whether dereferenced or not) is assigned to. Incrementing the std::front_insert_iterator is a no-op.
Contents |
[edit] Member types
| Member type | Definition |
container_type
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Container
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[edit] Member functions
constructs a new front_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) |
[edit] Member objects
| Member name | Definition |
container (protected)
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a pointer of type Container*
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Inherited from std::iterator
Member types
| Member type | Definition |
value_type
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void |
difference_type
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void |
pointer
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void |
reference
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void |
iterator_category
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std::output_iterator_tag |
[edit] Example
Run this code
#include <vector> #include <deque> #include <iostream> #include <iterator> #include <algorithm> int main() { std::vector<int> v{1,2,3,4,5}; std::deque<int> d; std::copy(v.begin(), v.end(), std::front_insert_iterator<std::deque<int>>(d)); // or std::front_inserter(d) for(int n : d) std::cout << n << ' '; std::cout << '\n'; }
Output:
5 4 3 2 1
[edit] See also
| creates a std::front_insert_iterator of type inferred from the argument (function template) | |
| iterator adaptor for insertion at the end of a container (class template) | |
| iterator adaptor for insertion into a container (class template) |