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Showing content from https://www.tutorialspoint.com/cpp_standard_library/cpp_set_emplace.htm below:

C++ Set Library - emplace Function

It inserts a new element in the set.

Following are the ways in which std::set::emplace works in various C++ versions.

template <class... Args>
  pair<iterator,bool> emplace (Args&&... args);

template <class... Args>
  pair<iterator,bool> emplace (Args&&... args);

It returns a pair of an iterator to the newly inserted element and a value of true.

If an exception is thrown, there are no changes in the container.

Depends on container size.

The following example shows the usage of std::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("bar");

   if (!ret.second) std::cout << "bar already exists in myset\n";

   return 0;
}

The above program will compile and execute properly.

bar already exists in myset

set.htm

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