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  1. #include <iostream>
  2. #include <vector>
  3. #include <algorithm>
  4.  
  5. using namespace std;
  6.  
  7. class someType {
  8. public:
  9.     someType() = default;
  10.     ~someType() = default;
  11.     virtual void print(ostream&) {}
  12.     friend ostream& operator << (ostream &os, someType *&value);
  13.     virtual double getData() {};
  14. };
  15.  
  16. ostream& operator << (ostream &os, someType *&value){
  17.     value->print(os);
  18.     return os;
  19. }
  20.  
  21. class doubleType : public someType {
  22. private:
  23.     double data;
  24. public:
  25.     doubleType(double data) : someType() {
  26.         this->data = data;
  27.     }
  28.     void print(ostream& os){
  29.         os << data;
  30.     }
  31.     double getData(){
  32.         return data;
  33.     }
  34. };
  35.  
  36.  
  37. class intType : public someType {
  38. private:
  39.     int data;
  40. public:
  41.     intType(int data) : someType() {
  42.         this->data = data;
  43.     }
  44.     void print(ostream& os){
  45.         os << data;
  46.     }
  47.     double getData(){
  48.         return data;
  49.     }
  50. };
  51.  
  52. class charType : public someType {
  53. private:
  54.     char data;
  55. public:
  56.     charType(char data) : someType() {
  57.         this->data = data;
  58.     }
  59.     void print(ostream& os){
  60.         os << data;
  61.     }
  62.     double getData(){
  63.         return data;
  64.     }
  65. };
  66.  
  67.  
  68.  
  69. int main(){
  70.     vector<someType*> el;
  71.     el.push_back(new charType('z'));
  72.     el.push_back(new intType(10));
  73.     el.push_back(new doubleType(10.01));
  74.     el.push_back(new charType('c'));
  75.  
  76.  
  77.     for_each(el.begin(), el.end(), [](someType* value) -> void {
  78.         cout << value << endl;
  79.     });
  80.  
  81.     sort(el.begin(), el.end(), [] (someType* first, someType* second) -> bool {
  82.         return first->getData() < second->getData();
  83.     });
  84. 	cout << endl;
  85.     for_each(el.begin(), el.end(), [](someType* value) -> void {
  86.         cout << value << endl;
  87.     });
  88. }
  89.  
Success #stdin #stdout 0s 4440KB
comments (?)
stdin
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Standard input is empty
stdout
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z
10
10.01
c

10
10.01
c
z
https://ideone.com/uTcl2V
language:
C++ (gcc 8.3)
created:
6 years ago
visibility:
public

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