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// set::emplace
#include <iostream>
#include <set>
#include <string>
int main ()
{
std::set<std::string> myset;
myset.emplace("foo");
myset.emplace("bar");
auto ret = myset.emplace("foo");
if (!ret.second) std::cout << "foo already exists in myset\n";
return 0;
}
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