swap_ranges


Category: algorithms 
Component type: function 
Prototype
template <class ForwardIterator1, class ForwardIterator2>
ForwardIterator2 swap_ranges(ForwardIterator1 first1, ForwardIterator1 last1,
ForwardIterator2 first2);
Description
Swap_ranges swaps each of the elements in the range
[first1, last1) with the corresponding element in the range
[first2, first2 + (last1  first1)). That is, for each integer n
such that 0 <= n < (last1  first1), it swaps *(first1 + n)
and *(first2 + n). The return value is first2 + (last1  first1).
Definition
Defined in the standard header algorithm, and in the nonstandard
backwardcompatibility header algo.h.
Requirements on types
ForwardIterator1 and ForwardIterator2 must both be models of
Forward Iterator. The value types of ForwardIterator1 and
ForwardIterator2 must be convertible to each other.
Preconditions

[first1, last1) is a valid range.

[first2, first2 + (last1  first1)) is a valid range.

The two ranges [first1, last1) and
[first2, first2 + (last1  first1)) do not overlap.
Complexity
Linear. Exactly last1  first1 swaps are performed.
Example
vector<int> V1, V2;
V1.push_back(1);
V1.push_back(2);
V2.push_back(3);
V2.push_back(4);
assert(V1[0] == 1 && V1[1] == 2 && V2[0] == 3 && V2[1] == 4);
swap_ranges(V1.begin(), V1.end(), V2.begin());
assert(V1[0] == 3 && V1[1] == 4 && V2[0] == 1 && V2[1] == 2);
Notes
See also
swap, iter_swap.
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