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  1. #include <iostream>
  2.  
  3. struct MyArray
  4. {
  5.     using value_type = double;  // make value_type an alias for double.
  6.  
  7.     explicit MyArray(unsigned size=64) 
  8.         : _storage(new value_type[size]), _capacity(size), _used(0) {}
  9.  
  10.     ~MyArray() { delete [] _storage; }
  11.  
  12.     unsigned capacity() const { return _capacity; }
  13.     unsigned size() const { return _used; }
  14.  
  15.     void add_value(value_type value);
  16.  
  17.     friend std::ostream& operator <<(std::ostream& out, const MyArray& arr);
  18.  
  19. private:
  20.  
  21.     value_type* _storage;
  22.  
  23.     unsigned _capacity;
  24.     unsigned _used;
  25. };
  26.  
  27. void MyArray::add_value(MyArray::value_type value)
  28. {
  29.     if (size() == capacity())
  30.     {
  31.         // grow the array.
  32.         throw;  // until functionality is implemented.
  33.     }
  34.  
  35.     _storage[_used++] = value;
  36. }
  37.  
  38. // display a MyArray:
  39. std::ostream& operator <<(std::ostream& out, const MyArray& arr)
  40. {
  41.     out << "{ ";
  42.  
  43.     if (arr.size())
  44.     {
  45.         unsigned i = 0;
  46.         while (i < arr.size() - 1)
  47.             out << arr._storage[i++] << ", ";
  48.         out << arr._storage[i] << ' ';
  49.     }
  50.  
  51.     return out << '}' ;
  52. }
  53.  
  54. int main()
  55. {
  56.     MyArray arr(3);
  57.     std::cout << arr << "\n\n";
  58.  
  59.     arr.add_value(1.1);
  60.     arr.add_value(2.2);
  61.     arr.add_value(3.3);
  62.  
  63.     std::cout << arr << '\n';
  64. }
  65.  
Success #stdin #stdout 0s 3428KB
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Standard input is empty
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{ }

{ 1.1, 2.2, 3.3 }
https://ideone.com/5rxCEM
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
secret

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