std::make_move_iterator

 

C++

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Technical Specifications

 

Iterator library

Iterator primitives
iterator_traits
input_iterator_tagoutput_iterator_tagforward_iterator_tagbidirectional_iterator_tagrandom_access_iterator_tag
iterator
Iterator adaptors
reverse_iterator move_iterator (C++11) back_insert_iterator front_insert_iterator insert_iterator	make_reverse_iterator (C++14) make_move_iterator (C++11) back_inserter front_inserter inserter
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istream_iterator
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ostreambuf_iterator
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advance
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rendcrend (C++14)(C++14)
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sizessize (C++17)(C++20)
empty (C++17)
data (C++17)

 

Defined in header <iterator>
template< class Iter > std::move_iterator<Iter> make_move_iterator( const Iter& i );		(since C++11) (until C++14)
template< class Iter > std::move_iterator<Iter> make_move_iterator( Iter i );		(since C++14) (until C++17)
template< class Iter > constexpr std::move_iterator<Iter> make_move_iterator( Iter i );		(since C++17)

make_move_iterator is a convenience function template that constructs a std::move_iterator for the given iterator i with the type deduced from the type of the argument.

Parameters

i

-

input iterator to be converted to move iterator

Return value

A std::move_iterator which can be used to move from the elements accessed through i

Possible implementation

template< class Iter > constexpr std::move_iterator<Iter> make_move_iterator( Iter i ) { return std::move_iterator<Iter>(i); }

Example

Run this code

#include <iostream>
#include <list>
#include <vector>
#include <string>
#include <iterator>
 
int main()
{
    std::list<std::string> s{"one", "two", "three"};
 
    std::vector<std::string> v1(s.begin(), s.end()); // copy
 
    std::vector<std::string> v2(std::make_move_iterator(s.begin()),
                                std::make_move_iterator(s.end())); // move
 
    std::cout << "v1 now holds: ";
    for (auto str : v1)
            std::cout << "\"" << str << "\" ";
    std::cout << "\nv2 now holds: ";
    for (auto str : v2)
            std::cout << "\"" << str << "\" ";
    std::cout << "\noriginal list now holds: ";
    for (auto str : s)
            std::cout << "\"" << str << "\" ";
    std::cout << '\n';
}

Possible output:

v1 now holds: "one" "two" "three"
v2 now holds: "one" "two" "three"
original list now holds: "" "" ""

See also

move_iterator (C++11)	iterator adaptor which dereferences to an rvalue reference (class template)
move (C++11)	obtains an rvalue reference (function template)