Just greater element or just smaller element in a multiset

How do I find just greater or just smaller element than a particular element in a multiset? For example, I have inserted some elements in a multiset, now I want to find the elements just smaller and just greater than some element that I have already inserted, how do I do that?

You can use lower_bound and upper_bound as -

// multiset::lower_bound/upper_bound
#include <iostream>
#include <set>

using namespace std;

int main ()
{
  std::multiset<int> mymultiset;
  std::multiset<int>::iterator itlow,itup;

  for (int i=1; i<8; i++) mymultiset.insert(i*10); 
  itlow = mymultiset.lower_bound (30);             //       ^

  std::cout << "mymultiset less then 30:";
  for (auto it=mymultiset.begin(); it!=itlow; ++it)
    std::cout << ' ' << *it;

  cout<<endl;

  itup = mymultiset.upper_bound (40);              //             ^

  std::cout << "mymultiset greater then 40:";
  for (; itup!=mymultiset.end(); ++itup)
    std::cout << ' ' << *itup;
    cout<<endl;

  return 0;
}