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

C++ Set Library - emplace_hint Function

It returns an iterator to the newly inserted element.

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

template <class... Args>
  iterator emplace_hint (const_iterator position, Args&&... args);

template <class... Args>
  iterator emplace_hint (const_iterator position, Args&&... args);

It returns an iterator to the newly inserted element.

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_hint.

#include <iostream>
#include <set>
#include <string>

int main () {
   std::set<std::string> myset;
   auto it = myset.cbegin();

   myset.emplace_hint (it,"sairam");
   it = myset.emplace_hint (myset.cend(),"krishna");
   it = myset.emplace_hint (it,"prasad");
   it = myset.emplace_hint (it,"Mammahe");

   std::cout << "myset contains:";
   for (const std::string& x: myset)
      std::cout << ' ' << x;
   std::cout << '\n';

   return 0;
}

The above program will compile and execute properly.

myset contains: Mammahe krishna prasad sairam

set.htm

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