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  1. #include <iostream>
  2.  
  3. template<typename T>
  4. class SharedPtr {
  5.     T* value;
  6.     int* ref_count;
  7.  
  8. public:
  9.     SharedPtr(T* value) : value(value) {
  10.         ref_count = new int;
  11.         *ref_count = 1;
  12.     }
  13.  
  14.     SharedPtr(const SharedPtr& other) {
  15.         value = other.value;
  16.         ref_count = other.ref_count;
  17.         (*ref_count)++;
  18.     }
  19.  
  20.     SharedPtr(SharedPtr&& other) {
  21.         value = other.value;
  22.         ref_count = other.ref_count;
  23.         other.ref_count = nullptr;
  24.     }
  25.  
  26.     ~SharedPtr() {
  27.         if (ref_count == nullptr) {
  28.             return;
  29.         }
  30.  
  31.         if (*ref_count == 1) {
  32.             delete value;
  33.             delete ref_count;
  34.         } else {
  35.             (*ref_count)--;
  36.         }
  37.     }
  38.  
  39.     T& operator *() const {
  40.         return *value;
  41.     }
  42.  
  43.     T* operator ->() const {
  44.         return value;
  45.     }
  46. };
  47.  
  48. struct Pituh {
  49.     Pituh() {
  50.         std::cout << "Koko()" << std::endl;
  51.     }
  52.     ~Pituh() {
  53.         std::cout << "~Koko()" << std::endl;
  54.     }
  55.     void kukareku() {
  56.         std::cout << "kukareku" << std::endl;
  57.     }
  58. };
  59.  
  60. void kukareknut1(SharedPtr<Pituh> pet) {
  61.     pet->kukareku();
  62. }
  63. void kukareknut2(SharedPtr<Pituh> pet) {
  64.     (*pet).kukareku();
  65. }
  66.  
  67. int main() {
  68.     {
  69.         SharedPtr<Pituh>(new Pituh);
  70.     }
  71.     std::cout << std::endl;
  72.  
  73.     {
  74.         SharedPtr<Pituh> x(new Pituh);
  75.         auto y = x;
  76.         kukareknut1(y);
  77.         kukareknut2(std::move(y));
  78.     }
  79.     std::cout << std::endl;
  80. }
Success #stdin #stdout 0s 5524KB
comments (?)
stdin 
Standard input is empty
stdout 
Koko()
~Koko()

Koko()
kukareku
kukareku
~Koko()
https://ideone.com/g7gqBM
language:
C++14 (gcc 8.3)
created:
5 years ago
visibility:
public

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