|Category: algorithms||Component type: function|
template <class InputIterator, class OutputIterator> OutputIterator copy(InputIterator first, InputIterator last, OutputIterator result);
The return value is result + (last - first)
vector<int> V(5); iota(V.begin(), V.end(), 1); list<int> L(V.size()); copy(V.begin(), V.end(), L.begin()); assert(equal(V.begin(), V.end(), L.begin()));
 Note the implications of this. Copy cannot be used to insert elements into an empty Container: it overwrites elements, rather than inserting elements. If you want to insert elements into a Sequence, you can either use its insert member function explicitly, or else you can use copy along with an insert_iterator adaptor.
 The order of assignments matters in the case where the input and output ranges overlap: copy may not be used if result is in the range [first, last). That is, it may not be used if the beginning of the output range overlaps with the input range, but it may be used if the end of the output range overlaps with the input range; copy_backward has opposite restrictions. If the two ranges are completely nonoverlapping, of course, then either algorithm may be used. The order of assignments also matters if result is an ostream_iterator, or some other iterator whose semantics depends on the order of assignments.