c++ - Moving elements from std::vector to another one

Question

How can I move some elements from first vector to second, and the elements will remove from the first?
if I am using std::move, the elements not removed from first vector.
this is the code I wrote:

   move(xSpaces1.begin() + 7, xSpaces1.end(), back_inserter(xSpaces2));

Answer 1

Resurrecting an old thread, but I am surprised that nobody mentioned std::make_move_iterator combined with insert. It has the important performance benefit of preallocating space in the target vector:

v2.insert(v2.end(), std::make_move_iterator(v1.begin() + 7), 
                    std::make_move_iterator(v1.end()));

As others have pointed out, first vector v1 is now in indeterminate state, so use erase to clear the mess:

v1.erase(v1.begin() + 7, v1.end());