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      std::front_inserter

      From cppreference.com
      <cpp‎ |iterator
       
       
      Iterator library
      Iterator concepts
      Iterator primitives
      Algorithm concepts and utilities
      Indirect callable concepts
      Common algorithm requirements
      (C++20)
      (C++20)
      (C++20)
      Utilities
      (C++20)
      Iterator adaptors
      Range access
      (C++11)(C++14)
      (C++14)(C++14)  
      (C++11)(C++14)
      (C++14)(C++14)  
      (C++17)(C++20)
      (C++17)
      (C++17)
       
      Defined in header<iterator>
      template<class Container>
      std::front_insert_iterator<Container> front_inserter( Container& c);
      		(constexpr since C++20)

      front_inserter is a convenience function template that constructs astd::front_insert_iterator for the containerc with the type deduced from the type of the argument.

      Contents

      [edit]Parameters

      c - container that supports apush_front operation

      [edit]Return value

      Astd::front_insert_iterator which can be used to add elements to the beginning of the containerc.

      [edit]Possible implementation

      template<class Container>std::front_insert_iterator<Container> front_inserter( Container& c){returnstd::front_insert_iterator<Container>(c);}

      [edit]Example

      Run this code
      #include <algorithm>#include <deque>#include <iostream>#include <iterator>#include <vector> int main(){std::vector<int> v{1,2,3,4,5};std::deque<int> d;std::copy(v.begin(), v.end(), std::front_inserter(d));for(int n: d)std::cout<< n<<' ';std::cout<<'\n';}

      Output:

      5 4 3 2 1

      [edit]See also

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