Constructor vs Destructor: Difference and Comparison

Constructor and destructor are words that have meanings in the same class. The name constructor was initially used for an object to initialize.

A destructor is initially used for someone who helps delete an object. The constructor and destructor are terms that arise from the same ring, but the two have differences.

Key Takeaways

  1. A constructor is a method used to initialize objects, while a destructor is used to destroy objects.
  2. Constructors are called automatically when an object is created, while destructors are called automatically when an object is destroyed.
  3. Constructors are used to setting initial values for variables, while destructors are used to release resources and clean up memory.

Constructor vs Destructor

Constructors initialize objects when they are created, setting default values and allocating memory. Destructors, conversely, release resources and memory occupied by objects when they are no longer needed, ensuring efficient program performance.

Constructor vs Destructor

There are many functions present, and out of those is the function of the constructor, which helps in allocating the memory of an object to help it get Initialized.

It is very easy to indicate which is a constructor as they are well defined to their name with the same classes. Construction is always to be named under the class section that is public.

There is a certain function in a class for doing things with an object, and one of those is the destructor function in a class which helps to dislocate the objects that were allocated before through a constructor. It is always to be named with the same class as their title by a person.

Comparison Table

Parameters of ComparisonConstructorDestructor
Main functionThere is an allocation of the memory of an object in this function.There is a=dis-allocation of memory of an object in this function.
ArgumentsThere is acceptance of arguments in this function.There is no acceptance of any argument in this function.
When it is calledWhen an object is created only at that time, this function is called up.When a program or a block is terminated, only at that time, this function is called up.
Numbers This can be available in numbers in one class.This can be available only in one number in a class.
OverloadingOverloading can take place.Overloading does not take place.

What is Constructor?

There are many functions present, and out of those is the function of the constructor, which helps in allocating the memory of an object to help it get Initialized.

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It is very easy to indicate which is a constructor as they are well defined to their name with the same classes. Construction is always to be named under the class section that is public.

A constructor has no type of return, meaning it isn’t void. In a class, there can be more than one constructor. This factor is known as an implicit constructor.

These Constructors are also called arguments that are defaulted. They also help to initialize an object for a person dynamically. A constructor does not have the property to inherit or be virtual.

There in total three types of constructors that is the default constructor, which helps to construct objects without having any arguments having no parameters, the parameterized constructor, which initializes objects with certain arguments which consist of different values and members and the copy constructors, which are totally different from other constructors as they accept the address of an object.

constructor 1

What is Destructor?

There is a certain function in a class for doing things with an object, and one of those is the destructor function in a class which helps to dislocate the objects that were allocated before through a constructor. It is always to be named with the same class as their title by a person.

A destructor is always preceded by a title (~). In short, the destructor function carries out performance in the reverse form of a constructor function by a person when it comes to editing an object in an out view.

Unlike in a constructor function, there is always only one destructor in every class. Because of this, they do not accept any argument.

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As soon as the control or execution leaves the block, the local objects are destroyed, and in a similar way, a global object is destroyed only when it terminates the entire object. This is basically known as a compiler.

destructor

Main Differences Between Constructor and Destructor

  1. In the constructor function, there is an allocation of the memory of an object; on the other hand, in the destructor function, there is a dislocation of the memory of an object.
  2. Arguments are accepted in the constructor function; on the other hand, arguments in the destructor function are not accepted.
  3. When an object is created only at that time, the constructor is called up, and on the other hand, when a program or a block is terminated only at that time, the destructor is called up.
  4. There can happen the existence of overloading in a constructor function; on the other hand, there cannot be any overloading in a destructor function.
  5. There is a possibility of having multiple constructors in a class; on the other hand, there can be only one destructor, unlike a constructor.
  6. An object is always seen in successive order in a constructor function, and on the other hand, an object is always seen in the reverse order of a constructor function in a destructor function.
References
  1. https://ieeexplore.ieee.org/abstract/document/5714442/

Last Updated : 17 August, 2023

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25 thoughts on “Constructor vs Destructor: Difference and Comparison”

  1. I appreciate the clear explanation of the differences between constructors and destructors. It’s interesting to understand how they both work to initialize and destroy objects.

    Reply
  2. The article does a great job in explaining the difference between constructors and destructors, and their unique functionalities. Very insightful.

    Reply
  3. I appreciate how the article delves into the practical applications of constructors and destructors, providing a clear understanding of their roles.

    Reply
  4. I found the explanation of how constructors and destructors work in a class to be very informative, and the examples were very helpful in understanding their roles.

    Reply
    • Certainly, understanding how constructors and destructors function is crucial for efficient memory management and resource release.

      Reply
    • I agree, the inclusion of real-life examples enhances the understanding of these essential functions in programming.

      Reply
  5. The article explains the function and importance of the constructor and destructor in a very well-structured manner. It’s informative and concise.

    Reply
  6. The comparison table is very useful to quickly understand the key differences between constructors and destructors. Great overview.

    Reply
  7. The comparison between constructors and destructors is greatly elucidated in the article, giving a clear understanding of their distinct functionalities and purposes.

    Reply
    • Agreed, the detailed comparison enhances the understanding of these fundamental concepts in programming and memory management.

      Reply
  8. The article effectively outlines the core functions of constructors and destructors, shedding light on their significance in programming and memory management.

    Reply
    • Absolutely, the detailed explanation of constructors and destructors provides valuable insight into memory management and object initialization.

      Reply
  9. The details provided about the differences between constructor and destructor greatly contribute to a comprehensive understanding of their distinct purposes.

    Reply
  10. The article provides a well-detailed explanation of constructors and destructors, making it easy to comprehend their individual roles and impact on program execution.

    Reply
    • Absolutely, understanding how constructors and destructors contribute to efficient memory management is vital for software developers and engineers.

      Reply

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