< cpp‎ | algorithm
Algorithm library
Execution policies (C++17)
Non-modifying sequence operations
Modifying sequence operations

Operations on uninitialized storage
Partitioning operations
Sorting operations
Binary search operations
Set operations (on sorted ranges)
Heap operations
Minimum/maximum operations

Numeric operations
C library
Defined in header <algorithm>
template< class InputIt, class OutputIt >
OutputIt move( InputIt first, InputIt last, OutputIt d_first );
(1) (since C++11)
template< class ExecutionPolicy, class InputIt, class OutputIt >
OutputIt move( ExecutionPolicy&& policy, InputIt first, InputIt last, OutputIt d_first );
(2) (since C++17)
1) Moves the elements in the range [first, last), to another range beginning at d_first. After this operation the elements in the moved-from range will still contain valid values of the appropriate type, but not necessarily the same values as before the move.
2) Same as (1), but executed according to policy. This overload does not participate in overload resolution unless std::is_execution_policy_v<std::decay_t<ExecutionPolicy>> is true


[edit] Parameters

first, last - the range of elements to move
d_first - the beginning of the destination range. If d_first is within [first, last), std::move_backward must be used instead of std::move.
policy - the execution policy to use. See execution policy for details.
Type requirements
InputIt must meet the requirements of InputIterator.
OutputIt must meet the requirements of OutputIterator.

[edit] Return value

Output iterator to the element past the last element moved (d_first + (last - first))

[edit] Complexity

Exactly last - first move assignments.

[edit] Exceptions

The overload with a template parameter named ExecutionPolicy reports errors as follows:

  • If execution of a function invoked as part of the algorithm throws an exception,
  • if policy is std::parallel_vector_execution_policy, std::terminate is called
  • if policy is std::sequential_execution_policy or std::parallel_execution_policy, the algorithm exits with an std::exception_list containing all uncaught exceptions. If there was only one uncaught exception, the algorithm may rethrow it without wrapping in std::exception_list. It is unspecified how much work the algorithm will perform before returning after the first exception was encountered.
  • if policy is some other type, the behavior is implementation-defined
  • If the algorithm fails to allocate memory (either for itself or to construct an std::exception_list when handling a user exception), std::bad_alloc is thrown.

[edit] Possible implementation

template<class InputIt, class OutputIt>
OutputIt move(InputIt first, InputIt last, OutputIt d_first)
    while (first != last) {
        *d_first++ = std::move(*first++);
    return d_first;

[edit] Notes

When moving overlapping ranges, std::move is appropriate when moving to the left (beginning of the destination range is outside the source range) while std::move_backward is appropriate when moving to the right (end of the destination range is outside the source range).

[edit] Example

The following code moves thread objects (which themselves are not copyable) from one container to another.

#include <iostream>
#include <vector>
#include <list>
#include <iterator>
#include <thread>
#include <chrono>
void f(int n)
    std::cout << "thread " << n << " ended" << '\n';
int main() 
    std::vector<std::thread> v;
    v.emplace_back(f, 1);
    v.emplace_back(f, 2);
    v.emplace_back(f, 3);
    std::list<std::thread> l;
    // copy() would not compile, because std::thread is noncopyable
    std::move(v.begin(), v.end(), std::back_inserter(l)); 
    for (auto& t : l) t.join();


thread 1 ended
thread 2 ended
thread 3 ended

[edit] See also

moves a range of elements to a new location in backwards order
(function template)
obtains an rvalue reference
(function template)