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Showing content from https://cplusplus.com/reference/valarray/valarray/swap/ below:

public member function

<valarray>

std::valarray::swap 
void swap (valarray& x) noexcept;

Swap valarray contents

Exchanges the contents of *this and x.

This operation is performed in constant time.



Parameters
x
Another valarray of the same type (with the same template argument, T). Sizes may differ.

Return value none

Example 
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// valarray::swap example
#include <iostream>     // std::cout
#include <valarray>     // std::valarray

int main ()
{
  std::valarray<int> foo {10,20,30,40};
  std::valarray<int> bar {100,200,300};

  foo.swap(bar);

  std::cout << "foo contains:";
  for (auto& x: foo) std::cout << ' ' << x;
  std::cout << '\n';

  std::cout << "bar contains:";
  for (auto& x: bar) std::cout << ' ' << x;
  std::cout << '\n';

  return 0;
}

Output: 
foo contains 100 200 300
bar contains 10 20 30 40


Complexity Constant.

Iterator validity All valid iterators, references and sub-arrays of both x and *this keep their validity, and are now referring to the same elements they referred to before the call, but in the other valarray.
Note that the end iterators do not refer to elements and may be invalidated.

Data races Both the object and x are modified.

Exception safetyNo-throw guarantee: this member function never throws exceptions.

See also
swap (valarray)
Swap valarrays (function template)
swap_ranges
Exchange values of two ranges (function template)

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