File to Map with structs

[PirateCat]

Currently trying to figure out how to read data from a file, line by line (getline) which be placed in a new Node which is initlized according to the Node constructor (see below). This should then be added to a map called map<string, Node> nodes where the string is the Node label.

Here are the structs that I have made:

struct Node{
  int x;
  int y;
  string label;

  Node()=default;
  Node(int i, int j, string l) :  x(i), y(j), label(l) {} ;
  string to_string () const;
  bool equal_nodes(const Node&);
  double distance(const Node &)const;
};

struct Network{
  string label;
  map<string, Node> nodes;
  vector<string> route;

  Network()=default;
  Network(ifstream &);
  string to_string () const;
  Node get_node(string);
  void put_node(Node);
  bool in_route(const Node&);
  Node closest(Node &);
  string calculate_route(const Node&, const Node&);
};

This is the function I was trying to start/do:

Network::Network(ifstream &) {

string label, line;
Node n;
map<string, Node> nodes;

	while (getline(fin, line)) {

	}

}

This is what is inputted in the main:

    string fname;
    cin >> fname;
    ifstream fin(fname);
    Network net(fin);
    Node n = net.nodes["A"];

This is the txt file I am suppose to be reading data from:

1 1 A
2 2 B
3 3 C
4 4 D

I expect the output, when I run through my function that turns the node into a string, as the following: A: (1, 1)

[JLBorges]

while( std::getline( fin, line ) ) {

    std::istringstream stm(line) ; // #include <sstream>

    int x, y ;
    std::string label ;

    if( stm >> x >> y >> label ) nodes.emplace( label, Node{ x, y, label } ) ;

    // uncomment if you want to stop processing further lines after a badly formed line is encountered
    // else fin.clear( std::ios::failbit ) ;
}

[PirateCat]

That worked and makes sense, thanks!