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  1. #include <iostream>
  2. #include <vector>
  3. using namespace std;
  4.  
  5. class node
  6. {
  7. public:
  8.     vector<node*> next;
  9.     void add_arc(node & a);
  10.  
  11.     string somestring;
  12.  
  13. };
  14.  
  15. void node::add_arc(node & a)
  16. {
  17.     node *b = &a;
  18.     next.push_back(b);       //only copyies nodes
  19. }
  20.  
  21. int main() {
  22.    vector<node> nodes;
  23.     node a;
  24.     node b;
  25.     node c;
  26.  
  27.     a.somestring = "a";
  28.     b.somestring = "b";
  29.     c.somestring = "c";
  30.  
  31.     a.add_arc(b);      //a should point to b
  32.     a.add_arc(c);      //a should point to c
  33.  
  34.     nodes.push_back(a);
  35.     nodes.push_back(b);
  36.     nodes.push_back(c);
  37.  
  38.     cout << nodes[0].next.size() << endl;           // prints "2", works fine
  39.     cout << nodes[0].next[0]->somestring << endl;  //empty
  40.     return 0;
  41. }
Success #stdin #stdout 0s 3464KB
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stdin
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Standard input is empty
stdout
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2
b
https://ideone.com/15cgKn
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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