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// swap valarrays
#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};
swap(foo,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;
}
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