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  1. #include <algorithm>
  2. #include <iostream>
  3. #include <vector>
  4.  
  5. template <typename T> class foo
  6. {
  7.   T attribute1;
  8.   std::vector<foo*> attribute2;  
  9.  
  10.  public:
  11.   foo(const T& data):attribute1(data){}
  12.  
  13.   // Some methods
  14.  
  15.   foo* getAttribute2(int pos)const
  16.   {
  17.     if (pos<0 || pos>=attribute2.size()) 
  18.         throw "In foo::getAttribute2, argument out of range";
  19.     return attribute2[pos];
  20. } 
  21.   void append(foo<T>* element) {attribute2.push_back(element);}
  22.  
  23.   void foo2vector(std::vector<T>& v)
  24.   {
  25.     v.push_back(attribute1);
  26.     if (attribute2.size()>0) 
  27.     {
  28.         for(int i=0; i<attribute2.size();i++) 
  29.             attribute2[i]->foo2vector(v);
  30.     }
  31.   }
  32.  
  33. void display3()const
  34. {
  35.     std::vector<T> v;
  36.     foo2vector(v);
  37.     std::reverse(v.begin(),v.end());
  38.     for (int i=0;i<v.size();i++)
  39.         std::cout<<v[i]<<"\t";
  40. }
  41.  
  42. };
  43.  
  44. int main()
  45. {
  46. foo<int>* root=new foo<int>(12);
  47. root->append(new foo<int>(8)); // node 0
  48. root->append(new foo<int>(23)); // node 1
  49. // Sons of node 0
  50. (root->getAttribute2(0))->append(new foo<int>(4));
  51. (root->getAttribute2(0))->append(new foo<int>(9));
  52. // Sons of node 1
  53. (root->getAttribute2(1))->append(new foo<int>(17)); // node 4
  54. root->display3();
  55. }
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin
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Standard input is empty
compilation info 
prog.cpp: In instantiation of 'void foo<T>::display3() const [with T = int]':
prog.cpp:54:16:   required from here
prog.cpp:36:17: error: passing 'const foo<int>' as 'this' argument of 'void foo<T>::foo2vector(std::vector<_RealType>&) [with T = int]' discards qualifiers [-fpermissive]
     foo2vector(v);
                 ^
stdout
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Standard output is empty
https://ideone.com/7i1HLP
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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