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

C++ Set begin() Function

It returns an iterator referring to the first element in the set container.

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

iterator begin();
const_iterator begin() const;

 iterator begin() noexcept;
const_iterator begin() const noexcept;

It returns an iterator referring to the first element in the set container.

It never throws exceptions.

Time complexity is contstant.

The following example shows the usage of std::set::begin.

#include <iostream>
#include <set>

int main () {
   int myints[] = {50,40,30,20,10};
   std::set<int> myset (myints,myints+10);

   std::cout << "myset contains:";
   for (std::set<int>::iterator it = myset.begin(); it!=myset.end(); ++it)
      std::cout << ' ' << *it;

   std::cout << '\n';

   return 0;
}

The above program will compile and execute properly.

myset contains: 0 1 10 20 30 40 50 26390 2065620553

set.htm

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