Initializing another class inside class c-CodePudding

I am trying to make a new Node class and set its coordinates in my class called Colony (my run function is inside of the Colony class). It is segfaulting though. I have tried using new but it isn't working. What should be the fix here? Heres a snippet of the code:

class Node {
public:
  std::vector<double> coords;
  vector<Node> parent;
  vector<Node> childList;
  vector<Attract> closestAtts;
};

class Colony {
public:
  double D, dk, di;
  vector<Attract> attlist;
  vector<Node> nodelist;
  std::vector<vector<double> > attractors;
  std::vector<vector<double> > centroids;

void run() {
// Initializes a colony with starting point
    Node start; 
    start.coords[0] = 100.0; 
    start.coords[1] = 100.0; 
    start.coords[2] = 100.0; 
    nodelist.push_back(start);
}

CodePudding user response：

In your run() method, you are trying to assign the 0th, 1st and 2nd elements of the start.coords vector, but these have not yet been assigned. Instead you should .push_back these values, like so:

void run() {
// Initializes a colony with starting point
    Node start; 
    start.coords.push_back(100.0); 
    start.coords.push_back(100.0); 
    start.coords.push_back(100.0); 
    nodelist.push_back(start);
}