Question

I have the following code:

set< vector<int> > set_of_things;
vector<int> triplet(3);

//set_of_things.push_back(stuff) - adding a number of things to the set

How do I now iterate through the set and print all elements?

The set is a collection of triplets so the output should look like:

1 2 3 
3 4 5
4 5 6

Answer 1

You use iterators:

for ( std::set<vector<int> >::iterator it = set_of_things.begin() ; 
      it != set_of_things.end() ; 
      it++ )
{
   // *it is a `vector<int>`
}

In C++11 you can use auto instead of std::set<vector<int> >::iterator.

If you’re not modifying the iterator, you should use a const_iterator instead.