I'm having problems accessing a list inside a vector. Bascially, how would I add a value to a list inside a vector with push_back()? Everything I have tried so far has just given me a segmentation fault.
I'm having problems accessing a list inside a vector. Bascially, how would I add a value to a list inside a vector with push_back()? Everything I have tried so far has just given me a segmentation fault.
Code:#include <iostream> #include <vector> #include <list> using namespace std; int main() { list<int> ListA; ListA.push_back(10); ListA.push_back(20); list<int> ListB; ListB.push_back(100); ListB.push_back(200); vector<list<int> > myVector; //Note space between "> >" myVector.push_back(ListA); myVector.push_back(ListB); cout<<myVector.back().back()<<endl; //Using back() to get a reference to a List: myVector.back().push_back(300); //myVector.back() is the last List in the vector cout<<myVector.back().back()<<endl; //Using array notation to get a reference to a List: myVector[1].push_back(400); //myVector[1] is the second List in the vector cout<<myVector[1].back()<<endl; return 0; }
Last edited by 7stud; 10-20-2005 at 05:11 PM.
This is what I have been trying lately and I cant figure out why it is getting a segmentation fault since there is a number in the list and I can get the list to work by itself. The output is just 1 then segmentation fault.
Code:#include <list> #include <vector> int main() { vector<list<int>* > v; list<int> one; v.push_back(&one); one.push_back(1); cout << one.front() << endl; cout << v[1]->front() << endl; return 0; }
v[1] should be v[0]. Remember that vectors (and arrays) have zero-based indexes, so a vector with one element has only one valid index - 0.
Yeah, I figured that out right before after I submitted it. Sad thing is that I have been working on that for about 2 hours now.
