Destructor, do I need one? C++

I am working on my assignment for a class, everything works, but when reading about copy constructors they often mention needing a destructor.  I wasn't sure if I needed one.  It seems that most examples are using arrays or dynamic content, which I don't use.  Can you look at my code and say if I need one?  Thanks!

// Fig. 8.16: complex1.cpp
 // Complex class member function definitions.
//Used the multiplication algorhythm posted in week 11 conference.
//Had some help from various sources tweaking my overloading.
 #include <iostream>
 
 using std::cout;
 
 #include"complex1.h"// Complex class definition
 
 // constructor
 Complex::Complex( double realPart, double imaginaryPart )
    : real( realPart ),
      imaginary( imaginaryPart )
 {
    // empty body
 
 } // end Complex constructor

 //Copy Constructor
 Complex::Complex(const Complex& operand2)
 {
       real = operand2.real;    
     imaginary = operand2.imaginary;
 }
 
 // addition operator
 Complex Complex::operator+( const Complex &operand2 ) const
 {
      return Complex( real + operand2.real,
       imaginary + operand2.imaginary );
 
 } // end function operator+
 
 // subtraction operator
 Complex Complex::operator-( const Complex &operand2 ) const
 {
      return Complex( real - operand2.real,
       imaginary - operand2.imaginary );
 
 } // end function operator-

 // I used the algorhthym posted in our conference.  I had something similar but my parens were off I think :)
 Complex Complex::operator*( const Complex &operand2 ) const
 {

      return Complex( ((real * operand2.real)-(imaginary * operand2.imaginary)), ((real * operand2.imaginary)+(operand2.real * imaginary)) );
 
 } // end function operator*

 Complex Complex::operator=(const Complex& operand2 )
 {
      if (this != &operand2)
      {
            real = operand2.real;    
            imaginary = operand2.imaginary;  
      }

      return *this;
}

std::ostream& operator<<(std::ostream& stream,const Complex& complexNumber)
 {
     stream << "(" << complexNumber.getReal() << " , " << complexNumber.getImaginary()<<")" ;
     return stream;
 }

 std::istream& operator>>(std::istream& stream,Complex& value)
 {
      double realPart, imaginaryPart;

      stream >> realPart >> imaginaryPart;
      value.getReal(realPart);
      value.getImaginary(imaginaryPart);

      return stream;  
 }


 
 bool Complex::operator==( const Complex &operand2 ) const
 {
       if (real == operand2.real && imaginary == operand2.imaginary)
             return true;
       else
             return false;
 }
 bool Complex::operator!=( const Complex &operand2 ) const
 {
       if (real != operand2.real || imaginary != operand2.imaginary)
             return true;
       else
             return false;
 }

---------------
#ifndef COMPLEX1_H
#define COMPLEX1_H
 
class Complex {
 
public:
    Complex( double = 0.0, double = 0.0 );                        // constructor
      Complex(const Complex& operand2);                              //Copy Constructor
    Complex operator+( const Complex & ) const;                  // addition
    Complex operator-( const Complex & ) const;                  // subtraction
      Complex operator*( const Complex &operand2 ) const; // Multiplication
      Complex operator=( const Complex& operand2 );            //overloaded assignment operator
    bool operator==( const Complex &operand2 ) const;
    bool operator!=( const Complex &operand2 ) const;

      //Friend overloaded Stream operators
    friend std::ostream &operator<<(std::ostream &stream, const Complex &value);
    friend std::istream &operator>>(std::istream &stream, Complex &value);

      //accessor functions
    double getReal() const { return real; }
    double getImaginary() const { return imaginary; }
    void getReal(double r) {  real = r; }
    void getImaginary(double i) { imaginary = i; }

private:
    double real;       // real part
    double imaginary;  // imaginary part

}; // end class Complex

#endif
urobinsAsked:
Who is Participating?
 
Infinity08Connect With a Mentor Commented:
You don't really need one since the only data contained in the class are two doubles (which will be removed automatically), but it doesn't hurt to put in an empty destructor.
0
 
AndyAinscowConnect With a Mentor Freelance programmer / ConsultantCommented:
You do not explicitly require one (you aren't assigning memory to be cleaned up).

However having a destructor would be (in my opinion) better coding - even if the destructor doesn't do anything
0
 
urobinsAuthor Commented:
so to put one in that didn't do anything I would just do

Complex::~Complex
{
}

Is that correct?
0
Cloud Class® Course: C++ 11 Fundamentals

This course will introduce you to C++ 11 and teach you about syntax fundamentals.

 
urobinsAuthor Commented:
You guys are quick by the way :)
0
 
Infinity08Commented:
Almost :

Complex::~Complex()
{
}
0
 
urobinsAuthor Commented:
oh doh!  Thanks guys.  I'm gonna split the points between you guys since I saw both answers at the same time, as always you guys are great!  
0
 
urobinsAuthor Commented:
As always Ininity08 and AndyAinscow were quick and provided the correct answer.  Stellar support and friendly too.
0
 
Jaime OlivaresSoftware ArchitectCommented:
Previous experts have clearly stated that constructor is unnecessay but desirable.
Still there is a use for your destructor (and your constructor too). You can use it to detect memory leaks, when you forget to free dynamically allocated objects:

public class Complex
{
public:
      static int objectCount = 0;

      Complex( double = 0.0, double = 0.0 );                        // constructor
      Complex(const Complex& operand2);                              //Copy Constructor
      ~Complex();   // destructor
}

 Complex::Complex( double realPart, double imaginaryPart )  : real( realPart ),  imaginary( imaginaryPart )
 {
     objectCount++;
 }
 Complex::Complex(const Complex& operand2)
 {
       real = operand2.real;    
       imaginary = operand2.imaginary;
       objectCount++;
 }
 Complex::~Complex()
{
       objectCount--;
}

So, before ending your application, objectCount should be 0, if not, there is a memory leak.
Also you can put messages in both contructors and destructor, for testing purposes.
0
 
urobinsAuthor Commented:
Thanks jaime_olivares, I appreciate the addition!  I looked at the link you provided about overloading my assignment operator and that is where I saw the destructor referenced.  I proceeded to look into that and it always showed deleteing or setting some value to 0 but it didn't appear I really had anything like that, so I was a bit confused.  I have everything working now, so thanks again to everyone who helped getting me going the right direction!
0
 
Jaime OlivaresSoftware ArchitectCommented:
sorry!!! big typo!!! Instead of:
>>Previous experts have clearly stated that constructor is unnecessay but desirable.
should be:
Previous experts have clearly stated that DESTRUCTOR is unnecessay but desirable.
0
 
urobinsAuthor Commented:
HAHA I didn't even notice it said Destructor over constructor :) I read what I wanted to see I guess :)
0
Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

All Courses

From novice to tech pro — start learning today.