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  1. #include <iostream>
  2. using std::cout;
  3. using std::endl;
  4.  
  5. class forlab
  6. {
  7. public:
  8.     std::string name;
  9.     int size;
  10.     int* arr;
  11.     forlab(std::string name, int size) {
  12.  
  13.         cout << "Ctor " << name << endl;
  14.  
  15.         this->size = size;
  16.         this->name = name;
  17.         *&arr = new int[size];
  18.         for (int i = 0; i < size; i++) {
  19.             arr[i] = 0;
  20.         }
  21.     }
  22.     forlab() {
  23.         cout << "Default ctor\n";
  24.         this->name = "";
  25.         this->size = 0;
  26.         this->arr = 0;
  27.     }
  28.     forlab(const forlab& f):name(f.name),size(f.size)
  29.     {
  30.  
  31.         cout << "Copy ctor " << name << endl;
  32.  
  33.         arr = new int[size];
  34.         for (int i = 0; i < size; i++) {
  35.             arr[i] = f.arr[i];
  36.         }
  37.     }
  38.     ~forlab() {
  39.         cout << "Dtor " << name << endl;
  40.  
  41.         delete [] this->arr;
  42.     }
  43.  
  44.     int& operator[] (const int index);
  45.     friend forlab operator+(const forlab a,const forlab b);
  46.     void show() {
  47.         for (int i = 0; i < size; i++) {
  48.             cout << this->arr[i] << " ";
  49.         }
  50.         cout << endl;
  51.     }
  52. };
  53.  
  54. int& forlab::operator[] (const int index)
  55. {
  56.     return this->arr[index];
  57. }
  58. forlab operator+(const forlab a, const forlab b) {
  59.     forlab temp("", a.size+b.size);
  60.     for (int i = 0; i < a.size; i++) {
  61.         temp.arr[i] = a.arr[i];
  62.     }
  63.     int counter = a.size;
  64.     for (int i = 0; i < b.size; i++) {
  65.         temp.arr[counter] = b.arr[i];
  66.         counter++;
  67.     }
  68.     return temp;
  69. }
  70.  
  71. int main() {
  72.     forlab ex1("first", 15);
  73.     forlab ex2("second", 20);
  74.     forlab ex3 = ex1 + ex2;
  75.     ex3.show();
  76.     return 0;
  77. }
  78.  
Success #stdin #stdout 0s 4380KB
comments (?)
stdin
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Standard input is empty
stdout
copy 
Ctor first
Ctor second
Copy ctor second
Copy ctor first
Ctor 
Dtor first
Dtor second
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
Dtor 
Dtor second
Dtor first
https://ideone.com/3eV9YS
language:
C++14 (gcc 8.3)
created:
3 years ago
visibility:
public

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