NAME¶

std::make_move_iterator - std::make_move_iterator

Synopsis¶

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

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>(std::move(i));
}

Example¶

// Run this code

#include <iostream>
#include <iomanip>
#include <list>
#include <vector>
#include <string>
#include <iterator>

auto print = [](auto const rem, auto const& seq) {
for (std::cout << rem; auto const& str : seq)
std::cout << std::quoted(str) << ' ';
std::cout << '\n';
};

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

print("v1 now holds: ", v1);
print("v2 now holds: ", v2);
print("original list now holds: ", s);
}

Possible output:¶

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

Defect reports

The following behavior-changing defect reports were applied retroactively to
previously published C++ standards.

DR Applied to Behavior as published Correct behavior
LWG 2061 C++11 make_move_iterator did not convert array made to convert
arguments to pointers

See also¶

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