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  1. #include <iostream>
  2. #include <vector>
  3.  
  4. using namespace std;
  5.  
  6. struct vertex;
  7.  
  8. vector< vertex > t;
  9.  
  10. struct vertex {
  11.     int nxt;
  12.     vertex() {
  13.         nxt = 0;
  14.     }
  15.     int getNext() {
  16.         if( nxt == 0 ) {
  17.         	cout << "t.size() = " << t.size() << endl;
  18.             nxt = t.size();
  19.             cout << "new nxt = " << nxt << endl;
  20.             t.push_back( vertex() );
  21.         }
  22.         cout << "nxt = " << nxt << endl;
  23.         return nxt;
  24.     }
  25. };
  26.  
  27. int main() {
  28.     t.push_back( vertex() );
  29.     cout << t[0].getNext() << endl;
  30.     cout << t[0].getNext() << endl;
  31.  
  32.     return 0;
  33. }
Success #stdin #stdout 0s 3472KB
comments (?)
stdin 
Standard input is empty
stdout 
t.size() = 1
new nxt = 1
nxt = 0
0
nxt = 1
1
https://ideone.com/wm67zx
language:
C++ (gcc 8.3)
created:
8 years ago
visibility:
public

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