74 lines
3.0 KiB
C++
74 lines
3.0 KiB
C++
// Fig. 11.4: MyArray.h
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// MyArray class definition with overloaded operators.
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#pragma once
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#include <initializer_list>
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#include <iostream>
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#include <memory>
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class MyArray final {
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// overloaded stream extraction operator
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friend std::istream& operator>>(std::istream& in, MyArray& a);
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// used by copy assignment operator to implement copy-and-swap idiom
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friend void swap(MyArray& a, MyArray& b) noexcept;
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public:
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explicit MyArray(size_t size); // construct a MyArray of size elements
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// construct a MyArray with a braced-initializer list of ints
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explicit MyArray(std::initializer_list<int> list);
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MyArray(const MyArray& original); // copy constructor
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MyArray& operator=(const MyArray& right); // copy assignment operator
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MyArray(MyArray&& original) noexcept; // move constructor
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MyArray& operator=(MyArray&& right) noexcept; // move assignment
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~MyArray(); // destructor
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size_t size() const noexcept {return m_size;}; // return size
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std::string toString() const; // create string representation
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// equality operator
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bool operator==(const MyArray& right) const noexcept;
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// subscript operator for non-const objects returns modifiable lvalue
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int& operator[](size_t index);
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// subscript operator for const objects returns non-modifiable lvalue
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const int& operator[](size_t index) const;
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// convert MyArray to a bool value: true if non-empty; false if empty
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explicit operator bool() const noexcept {return size() != 0;}
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// preincrement every element, then return updated MyArray
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MyArray& operator++();
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// postincrement every element, and return copy of original MyArray
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MyArray operator++(int);
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// add value to every element, then return updated MyArray
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MyArray& operator+=(int value);
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private:
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size_t m_size{0}; // pointer-based array size
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std::unique_ptr<int[]> m_ptr; // smart pointer to integer array
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};
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// overloaded operator<< is not a friend--does not access private data
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std::ostream& operator<<(std::ostream& out, const MyArray& a);
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/**************************************************************************
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* (C) Copyright 1992-2022 by Deitel & Associates, Inc. and *
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* Pearson Education, Inc. All Rights Reserved. *
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* *
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* DISCLAIMER: The authors and publisher of this book have used their *
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* best efforts in preparing the book. These efforts include the *
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* development, research, and testing of the theories and programs *
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* to determine their effectiveness. The authors and publisher make *
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* no warranty of any kind, expressed or implied, with regard to these *
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* programs or to the documentation contained in these books. The authors *
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* and publisher shall not be liable in any event for incidental or *
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* consequential damages in connection with, or arising out of, the *
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* furnishing, performance, or use of these programs. *
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**************************************************************************/
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