How to use pointers to point to vector of a struct?

Question

struct Edge;

struct Node {
    int id;
    vector<Edge> *edges;
};

struct Edge {
    int id;
    Node* vertex1;
    Node* vertex2;
};

int main(){
    vector<Edge> nodeEdgeList;
    Node* nodePtr = new Node;
    nodePtr->id = vertex;
    nodePtr->edges = nodeEdgeList;
}

I get the following compiler error due to the last line.

error: cannot convert 'std::vector<Edge, std::allocator<Edge> >' to 'std::vector<Edge, std::allocator<Edge> >*' in assignment

Answer 1

You Node class has a vector * as a member you are trying to set a non pointer to a pointer

The error message is pretty clear here error: cannot convert 'std::vector<Edge, std::allocator<Edge> >' to 'std::vector<Edge, std::allocator<Edge> >*' in assignment

so change to:

int main(){
    vector<Edge> *nodeEdgeList = new Vector<Edge>;
    Node* nodePtr = new Node;
    nodePtr->id = vertex;
    nodePtr->edges = nodeEdgeList;
}

or

int main(){
    vector<Edge> nodeEdgeList;
    Node* nodePtr = new Node;
    nodePtr->id = vertex;
    nodePtr->edges = &nodeEdgeList;
}

Answer 2

int main(){
    vector<Edge> nodeEdgeList;
    Node* nodePtr = new Node;
    nodePtr->id = vertex;
    nodePtr->edges = &nodeEdgeList; // <-- use & before
}