Question

Assuming that:

vector<string> mvec; 

has some elements on it

Partial code:

for(vector<string>::iterator it1 = mvec.begin(); it1 != mvec.end(); ++it1) {  
for(string::iterator it2 = it1->begin(); it2 != it1->end(); ++it2)

since:

it1->begin() deference the object and then invoke the member function begin() of that object, which object is it1 pointing to?

String?

Answer 1

Since it1 is an iterator for vector<string> when you derefence it you will get a string.