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// unordered_set::emplace
#include <iostream>
#include <string>
#include <unordered_set>
int main ()
{
std::unordered_set<std::string> myset;
myset.emplace ("potatoes");
myset.emplace ("milk");
myset.emplace ("flour");
std::cout << "myset contains:";
for (const std::string& x: myset) std::cout << " " << x;
std::cout << std::endl;
return 0;
}
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