< cpp‎ | algorithm
Algorithm library
Constrained algorithms and algorithms on ranges (C++20)
Concepts and utilities: std::Sortable, std::projected, ...
Constrained algorithms: std::ranges::copy, std::ranges::sort, ...
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 ForwardIt, class OutputIt >

OutputIt rotate_copy( ForwardIt first, ForwardIt n_first,

                      ForwardIt last, OutputIt d_first );
(until C++20)
template< class ForwardIt, class OutputIt >

constexpr OutputIt rotate_copy( ForwardIt first, ForwardIt n_first,

                                ForwardIt last, OutputIt d_first );
(since C++20)
template< class ExecutionPolicy, class ForwardIt1, class ForwardIt2 >

ForwardIt2 rotate_copy( ExecutionPolicy&& policy, ForwardIt1 first, ForwardIt1 n_first,

                      ForwardIt1 last, ForwardIt2 d_first );
(2) (since C++17)
1) Copies the elements from the range [first, last), to another range beginning at d_first in such a way, that the element n_first becomes the first element of the new range and n_first - 1 becomes the last element.
2) Same as (1), but executed according to policy. This overload only participates in overload resolution if std::is_execution_policy_v<std::decay_t<ExecutionPolicy>> is true


first, last - the range of elements to copy
n_first - an iterator to an element in [first, last) that should appear at the beginning of the new range
d_first - beginning of the destination range
policy - the execution policy to use. See execution policy for details.
Type requirements
ForwardIt, ForwardIt1, ForwardIt2 must meet the requirements of LegacyForwardIterator.
OutputIt must meet the requirements of LegacyOutputIterator.

Return value

Output iterator to the element past the last element copied.


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 and ExecutionPolicy is one of the standard policies, std::terminate is called. For any other ExecutionPolicy, the behavior is implementation-defined.
  • If the algorithm fails to allocate memory, std::bad_alloc is thrown.

Possible implementation

See also the implementations in libstdc++ and libc++.

template<class ForwardIt, class OutputIt>
OutputIt rotate_copy(ForwardIt first, ForwardIt n_first,
                           ForwardIt last, OutputIt d_first)
    d_first = std::copy(n_first, last, d_first);
    return std::copy(first, n_first, d_first);


#include <algorithm>
#include <vector>
#include <iostream>
int main()
    std::vector<int> src = {1, 2, 3, 4, 5}; 
    auto pivot = std::find(src.begin(), src.end(), 3); 
    std::vector<int> dest(src.size());                                          
    std::rotate_copy(src.begin(), pivot, src.end(), dest.begin());
    for (const auto &i : dest) {
        std::cout << i << ' ';
    std::cout << '\n';


3 4 5 1 2


linear in the distance between first and last

See also

rotates the order of elements in a range
(function template)