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INSTRUCTIONS: In this assignment, you will make your own smart pointer type. You will write the following class to develop a referenced counted smart pointer. You will also implement a few other member functions to resemble the functionality of an ordinary raw pointer. Basically, this is a problem of designing a single, non-trivial class and overloading a few pointer related operators. You may not use any of the STLs except for stdexcept, to do this, i.e., please dont try and use a shared_ptr to implement the class. You can start with this code, and you may add other member functions, if you want. C++ LANGUAGE

INSTRUCTIONS: In this assignment, you will make your own smart pointer type. You will write the following class to develop a referenced counted smart pointer. You will also implement a few other member functions to resemble the functionality of an ordinary raw pointer. Basically, this is a problem of designing a single, non-trivial class and overloading a few pointer related operators. You may not use any of the STLs except for stdexcept, to do this, i.e., please dont try and use a shared_ptr to implement the class. You can start with this code, and you may add other member functions, if you want. C++ LANGUAGE

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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INSTRUCTIONS: In this assignment, you will make your own smart pointer type. You will write the following class to develop a referenced counted smart pointer. You will also implement a few other member functions to resemble the functionality of an ordinary raw pointer. Basically, this is a problem of designing a single, non-trivial class and overloading a few pointer related operators. You may not use any of the STLs except for stdexcept, to do this, i.e., please dont try and use a shared_ptr to implement the class. You can start with this code, and you may add other member functions, if you want.

C++ LANGUAGE

 

Only need smart_ptr.h file.

```cpp template <typename T> class smart_ptr { public: smart_ptr(); // Create a smart_ptr that is initialized to nullptr. The // reference count should be initialized to nullptr. explicit smart_ptr(T* raw_ptr); // Create a smart_ptr that is initialized to raw_ptr. The // reference count should be one. Make sure it points to // the same pointer as the raw_ptr. smart_ptr(const smart_ptr& rhs); // Copy construct a pointer from rhs. The reference count // should be incremented by one. smart_ptr(smart_ptr&& rhs); // Move construct a pointer from rhs. smart_ptr& operator=(const smart_ptr& rhs); // This assignment should make a shallow copy of the // right-hand side's pointer data. The reference count // should be incremented as appropriate. smart_ptr& operator=(smart_ptr&& rhs); // This move assignment should steal the right-hand side's // pointer data. bool clone(); // If the smart_ptr is either nullptr or has a reference // count of one, this function will do nothing and return // false. Otherwise, the referred to object's reference // count will be decreased and a new deep copy of the // object will be created. This new copy will be the // object that this smart_ptr points and its reference // count will be one. int ref_count() const; // Returns the reference count of the pointed to data. T& operator*(); // The dereference operator shall return a reference to // the referred object. Throws null_ptr_exception on // invalid access. T* operator->(); // The arrow operator shall return the pointer ptr_. // Throws null_ptr_exception on invalid access. ~smart_ptr(); // deallocate all dynamic memory private: T* ptr_; // pointer to the referred object int* ref_; // pointer to a reference count }; ``` This code defines a template class `smart_ptr` intended to manage memory safely using a reference counting mechanism. It includes constructors for initializing the smart pointer, operators for copying, moving, and dereferencing, and a function to clone the underlying object if needed. The class also manages the deallocation of the dynamic memory upon destruction.
Transcribed Image Text:```cpp template <typename T> class smart_ptr { public: smart_ptr(); // Create a smart_ptr that is initialized to nullptr. The // reference count should be initialized to nullptr. explicit smart_ptr(T* raw_ptr); // Create a smart_ptr that is initialized to raw_ptr. The // reference count should be one. Make sure it points to // the same pointer as the raw_ptr. smart_ptr(const smart_ptr& rhs); // Copy construct a pointer from rhs. The reference count // should be incremented by one. smart_ptr(smart_ptr&& rhs); // Move construct a pointer from rhs. smart_ptr& operator=(const smart_ptr& rhs); // This assignment should make a shallow copy of the // right-hand side's pointer data. The reference count // should be incremented as appropriate. smart_ptr& operator=(smart_ptr&& rhs); // This move assignment should steal the right-hand side's // pointer data. bool clone(); // If the smart_ptr is either nullptr or has a reference // count of one, this function will do nothing and return // false. Otherwise, the referred to object's reference // count will be decreased and a new deep copy of the // object will be created. This new copy will be the // object that this smart_ptr points and its reference // count will be one. int ref_count() const; // Returns the reference count of the pointed to data. T& operator*(); // The dereference operator shall return a reference to // the referred object. Throws null_ptr_exception on // invalid access. T* operator->(); // The arrow operator shall return the pointer ptr_. // Throws null_ptr_exception on invalid access. ~smart_ptr(); // deallocate all dynamic memory private: T* ptr_; // pointer to the referred object int* ref_; // pointer to a reference count }; ``` This code defines a template class `smart_ptr` intended to manage memory safely using a reference counting mechanism. It includes constructors for initializing the smart pointer, operators for copying, moving, and dereferencing, and a function to clone the underlying object if needed. The class also manages the deallocation of the dynamic memory upon destruction.
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