// Fig. 11.4: MyArray.h
// MyArray class definition with overloaded operators.
#pragma once
#include <initializer_list>
#include <iostream>
#include <memory>

class MyArray final {
   // overloaded stream extraction operator
   friend std::istream& operator>>(std::istream& in, MyArray& a);

   // used by copy assignment operator to implement copy-and-swap idiom
   friend void swap(MyArray& a, MyArray& b) noexcept;

public:
   explicit MyArray(size_t size); // construct a MyArray of size elements

   // construct a MyArray with a braced-initializer list of ints
   explicit MyArray(std::initializer_list<int> list);

   MyArray(const MyArray& original); // copy constructor
   MyArray& operator=(const MyArray& right); // copy assignment operator

   MyArray(MyArray&& original) noexcept; // move constructor
   MyArray& operator=(MyArray&& right) noexcept; // move assignment

   ~MyArray(); // destructor 

   size_t size() const noexcept { return m_size; }; // return size
   std::string toString() const; // create string representation

   // equality operator
   bool operator==(const MyArray& right) const noexcept;

   // subscript operator for non-const objects returns modifiable lvalue
   int& operator[](size_t index);

   // subscript operator for const objects returns non-modifiable lvalue
   const int& operator[](size_t index) const;

   // convert MyArray to a bool value: true if non-empty; false if empty
   explicit operator bool() const noexcept { return size() != 0; }

   // preincrement every element, then return updated MyArray  
   MyArray& operator++();

   // postincrement every element, and return copy of original MyArray  
   MyArray operator++(int);

   // add value to every element, then return updated MyArray
   MyArray& operator+=(int value);
private:
   size_t m_size{0}; // pointer-based array size
   std::unique_ptr<int[]> m_ptr; // smart pointer to integer array
};

// overloaded operator<< is not a friend--does not access private data
std::ostream& operator<<(std::ostream& out, const MyArray& a);

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