Implement the functions given, instructions of what each function needs to do is given in their respective comments. Only need a smart_ptr.h file. // 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 memoryprivate:// pointer to the referred object// pointer to a reference countT* ptr_;int* ref_;} ; Requirements/HintsHere are some of the requirements for writing the class. Test the implemented memberfunctions to verify their basic functionality, and also how much of the desired semanticsthat is achieved by this implementation, and also if there are any undesired effects.1. The null_ptr_exception is an exception that you will define, it should bederived from an STL exception.2. Label the above member functions as noexcept where appropriate.3. You may add additional member functions, if you'd like.4. Recognize that move constructors/assignments result in the reference countremaining the same, hence there's no need to change it.5. Think about writing as exception safe code as possible. What type of guaranteesshould each member function have?

Answered: int ref_count () const; // Returns the…

Computer Networking: A Top-Down Approach (7th Edition)

7th Edition

ISBN:9780133594140

Author:James Kurose, Keith Ross

Publisher:James Kurose, Keith Ross

Chapter1: Computer Networks And The Internet

Section: Chapter Questions

Problem R1RQ: What is the difference between a host and an end system? List several different types of end...

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Question

Implement the functions given, instructions of what each function needs to do is given in their respective comments. Only need a smart_ptr.h file.

// 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:
// pointer to the referred object
// pointer to a reference count
T* ptr_;
int* ref_;
} ;

Requirements/Hints
Here are some of the requirements for writing the class. Test the implemented member
functions to verify their basic functionality, and also how much of the desired semantics
that is achieved by this implementation, and also if there are any undesired effects.
1. The null_ptr_exception is an exception that you will define, it should be
derived from an STL exception.
2. Label the above member functions as noexcept where appropriate.
3. You may add additional member functions, if you'd like.
4. Recognize that move constructors/assignments result in the reference count
remaining the same, hence there's no need to change it.
5. Think about writing as exception safe code as possible. What type of guarantees
should each member function have?

Expert Solution

Step 1

First of all you have not mentioned anywhere that templating is used in the code. So please mention it next time before uploading the question. First of all before asking this question you should have good understanding of pointers and class. these two are the prerequisites for this question. In the next step I have provided the code.