Not able to to do set element insertion inside constructor

I am getting compilation error while inserting values inside constructor Monitor counstructor. Could you suggest what could be approach for the same as I need to populate this vector during class instantiation. It works fine with below approach but I don't want to populate the vector separately.

   vect1.insert( make_pair(10,20) );
   vect1.insert( make_pair(30,49) );
   vect1.insert( make_pair(50,60) );
   vect1.insert( make_pair(70,80) );

below is the code snippet

  #include <iostream>
  #include <vector>
  #include<algorithm>
  #include<memory>
  #include <set>
  using namespace std;
  class Monitor
  {
  public:
  virtual ~Monitor() = default;
  explicit Monitor(
  const set< pair <double,double> > &vect1
  )
  {  

     for (auto &itr : vect1 ) 
      { 
         std::cout<<"value1 ="<<itr.first<<endl;
         std::cout<<"value2="<<itr.second<<endl;
      }       
  }

 };

int main()
{  set< pair <double,double> > vect1;
   Monitor obj (vect1.insert( make_pair(10,20) ));

 return 0;   
}

compilation error

error: no matching function for call to ‘Monitor::Monitor(std::pair >, bool>)’
    Monitor obj (vect1.insert( make_pair(10,20) ));