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std::move in C++
  • Difficulty Level : Easy
  • Last Updated : 20 Jul, 2017

std :: move
Moves the elements in the range [first,last] into the range beginning at result.
The value of the elements in the [first,last] is transferred to the elements pointed by result. After the call, the elements in the range [first,last] are left in an unspecified but valid state.
Template :

OutputIterator move (InputIterator first, InputIterator last, OutputIterator result);

Parameters :

first, last
Input iterators to the initial and final positions in a sequence
to be moved. The range used is [first,last], which contains all
the elements between first and last, including the element pointed
by first but not the element pointed by last.

result
Output iterator to the initial position in the destination sequence.
This shall not point to any element in the range [first,last].

Return type :
An iterator to the end of the destination range where elements have been moved.

Examples:

Input :
vec1 contains : 1 2 3 4 5
vec2 contains : 7 7 7 7 7
Output :
arr2 contains : 7 1 2 3 4
/*First 4 elements of vector vec1 moved to vec2 starting second position*/




// CPP program to illustrate
// std::move and std::move_backward
// STL library functions
#include<bits/stdc++.h>
  
// Driver code
int main()
{
    std :: vector <int> vec1 {1, 2, 3, 4, 5};
    std :: vector <int> vec2 {7, 7, 7, 7, 7};
  
    // Print elements
    std :: cout << "Vector1 contains :";
    for(int i = 0; i < vec1.size(); i++)
        std :: cout << " " << vec1[i];
    std :: cout << "\n";
      
    // Print elements
    std :: cout << "Vector2 contains :";
    for(unsigned int i = 0; i < vec2.size(); i++)
        std :: cout << " " << vec2[i];
    std :: cout << "\n\n";
      
    // std :: move function
    // move first 4 element from vec1 to starting position of vec2
    std :: move (vec1.begin(), vec1.begin() + 4, vec2.begin() + 1);
      
    // Print elements
    std :: cout << "Vector2 contains after std::move function:";
    for(unsigned int i = 0; i < vec2.size(); i++)
        std :: cout << " " << vec2[i];
    std :: cout << "\n";
  
  
  
    return 0;
}

Output:

Vector1 contains : 1 2 3 4 5
Vector2 contains : 7 7 7 7 7

Vector2 contains after std::move function: 7 1 2 3 4

This article is contributed by Sachin Bisht. If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

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