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× C++ Standard Library C++ STL Library


The C++ multiset::value_comp function is used to return a copy of the comparison object used by the container. By default, it is a less object, which returns the same as operator<.

Syntax

value_compare value_comp() const;
value_compare value_comp() const;

Parameters

No parameter is required.

Return Value

The comparison object associated to the container.

Time Complexity

Constant i.e, Θ(1).

Example:

In the below example, the multiset::value_comp function is used print all elements in the given multiset which are less than 50.

#include <iostream>
#include <set>
using namespace std;
 
int main (){
  multiset<int> MSet{10, 20, 20, 30, 30, 40, 70, 80, 90};
  multiset<int>::iterator it;

  //printing the content of the multiset
  cout<<"MSet contains:";
  for(it = MSet.begin(); it != MSet.end(); ++it)
    cout<<" "<<*it;

  //creating a value_comp object
  multiset<int>::value_compare MyComp = MSet.value_comp();

  //printing all elements in multiset which are 
  //less than 50 using value_comp object
  it = MSet.begin();
  cout<<"\n\nElements of MSet which are less than 50:\n";
  while(MyComp(*it, 50)){
    cout<<*it<<" ";
    it++;
  }

  return 0;
}

The output of the above code will be:

MSet contains: 10 20 20 30 30 40 70 80 90

Elements of MSet which are less than 50:
10 20 20 30 30 40 

❮ C++ <set> Library