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| // unordered_set::swap #include <iostream> #include <string> #include <unordered_set> int main () { std::unordered_set<std::string> first = {"iron","copper","oil"}, second = {"wood","corn","milk"}; first.swap(second); std::cout << "first:"; for (const std::string& x: first) std::cout << " " << x; std::cout << std::endl; std::cout << "second:"; for (const std::string& x: second) std::cout << " " << x; std::cout << std::endl; return 0; }
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