Printing vector of sets in c++

Question

Is there anyway to print a vector of sets easily?

#include <iostream>
#include <set>
#include <vector>

int main ()
{
  std::set<int> myset;
  std::vector<std::set<int> > setVector;
  int myints[] = {5,10,15};
  int elementCount = sizeof(myints) / sizeof(myints[0]);
  myset.insert(myints, myints + elementCount);
  setVector.push_back(myset);
  std::cout << "Elements in vector: " << setVector.size() << " \n";
}

I have added the set to the vector, is there anyway to print it out?

This is just a proof of concept, eventually I will add many more sets to this vector, so ideally I will need to print from the beginning of the vector to the end

Thank you

Answer 1

That's quite simple to accomplish using nested range-based loops (introduced by C++11):

for(std::set<int> const &mySet : setVector){
  for(const int i : mySet){
    std::cout << i << " ";
  }
}

Example

Answer 2

You can have a look to my (header only) to_string library.

Answer 3

std::ostream& operator<<(std::ostream& os, const std::set<int>& s) {
    std::copy(s.begin(), s.end(), 
        std::ostream_iterator<int>(os,","));
    return os;
}

template<typename T>
std::ostream& operator<<(std::ostream& os, const std::vector<T>& s) {
    os << "{";
    typename std::vector<T>::const_iterator it = s.begin();
    for( ; it != s.end(); ++it)
        os << *it;

    os << "}";
    return os;
}

Then you can do

std::cout << setVector;

Answer 4

You can print them directly as :

for(int i=0;i<setVector.size();i++)
{
      for(set<int>::iterator iter=setVector[i].begin();iter!=setVector[i].end();iter++)
}