std::front_inserter

 

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Stream iterators istream_iterator    ostream_iterator istreambuf_iterator ostreambuf_iterator	Iterator customization points ranges::iter_move (C++20) ranges::iter_swap (C++20)
Iterator operations advance distance prev (C++11)   next (C++11) ranges::advance (C++20) ranges::distance (C++20) ranges::prev (C++20) ranges::next (C++20)	Range access begincbegin (C++11)(C++14) rbegincrbegin (C++14)(C++14)   endcend (C++11)(C++14) rendcrend (C++14)(C++14)   sizessize (C++17)(C++20) empty (C++17) data (C++17)

 

Template:ddcl list begin <tr class="t-dsc-header">

<td>

Defined in header <iterator>

</td>

<td></td> <td></td> </tr> <tr class="t-dcl ">

<td class="t-dcl-nopad">

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

</td>

<td class="t-dcl-nopad"> </td> <td class="t-dcl-nopad"> </td> </tr> Template:ddcl list end

front_inserter is a convenience function template that constructs a std::front_insert_iterator for the container c with the type deduced from the type of the argument.

Parameters

c

-

container that supports a push_front operation

Return value

A std::front_insert_iterator which can be used to add elements to the beginning of the container c

Example

Run this code

#include <iostream>
#include <deque>
#include <algorithm>
#include <iterator>
int main()
{
    std::deque<int> v{1,2,3,4,5,6,7,8,9,10};
    std::fill_n(std::front_inserter(v), 3, -1);
    for(int n : v)
        std::cout << n << ' ';
}

Output:

-1 -1 -1 1 2 3 4 5 6 7 8 9 10

See also

Template:cpp/iterator/dcl list front insert iteratorTemplate:cpp/iterator/dcl list back inserterTemplate:cpp/iterator/dcl list inserter