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// tuple::swap
#include <iostream>
#include <tuple>
int main ()
{
std::tuple<int,char> a (10,'x');
std::tuple<int,char> b (20,'y');
a.swap(b);
std::cout << "a contains: " << std::get<0>(a);
std::cout << " and " << std::get<1>(a) << std::endl;
return 0;
}
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