Question

I would like to rewrite this for loop (which works)

for (vector<shared_ptr<Node<int>>>::iterator it = n.root.children.begin();
    it != n.root.children.end(); 
    ++it) 
    {cout << (*it)->value<<flush;}

into a range-based for loop. What I tried is

for (shared_ptr<Node<int>> child:(n.root).children){
       cout<<(child->value)<<" "<<flush;
    }

but it gives me a core dump. The root is of type Node

template <typename T>
class Node{
public:
    T value;
    vector<shared_ptr<Node>> children;
};

These lines in main.cpp work fine.

cout<<(n.root).value<<flush;
cout<<n.root.children.front()->value<<flush;

I use g++ 4.7.2.

Answer 1

Here ya go. Try this.

for (auto v : n.root.children ) {
    cout << v->value << flush;
}