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// unordered_map::swap
#include <iostream>
#include <string>
#include <unordered_map>
int main ()
{
std::unordered_map<std::string,std::string>
first = {{"Star Wars","G. Lucas"},{"Alien","R. Scott"},{"Terminator","J. Cameron"}},
second = {{"Inception","C. Nolan"},{"Donnie Darko","R. Kelly"}};
first.swap(second);
std::cout << "first: ";
for (auto& x: first) std::cout << x.first << " (" << x.second << "), ";
std::cout << std::endl;
std::cout << "second: ";
for (auto& x: second) std::cout << x.first << " (" << x.second << "), ";
std::cout << std::endl;
return 0;
}
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