Tag: delete
How does new and delete operator works internally ?
In this article we will discuss how new and delete operator works internally in C++.new operator is used to dynamically allocate memory on heap and delete operator is used to delete the memory from the heap allocated by new operator. Usage example of new and delete operator is as follows, #include <iostream> class Sample { …
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Difference between delete & []delete and rise of Memory Leaks
In this article we will discuss the difference between delete &Â []delete and how mixing new [] with delete can give rise to Memory Leaks. To allocate memory dynamically on heap we use new[] operator i.e. Advertisements class Sample; Sample * ptrArr = new Sample[5]; Here new[] performs following operations internally, In first step, it …
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Overloading new and delete operators at Global and Class level
In this article we will discuss why we should overload new and delete operator and how to do it. When we create a new Object on heap by calling new operator then it does following things internally, Advertisements First it allocates the required memory by calling operator new i.e. operator new returns the pointer top …
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Different ways to Erase / Delete an element from a Set in C++
In this article we will discuss different ways to remove an element from Set. std::set provides 3 overloaded version of erase() member function. We will discuss them one by one. Advertisements Suppose we have a set of strings i.e. //Set Of Strings std::set<std::string> setOfStrs = {“Hi”, “Hello”, “is”, “the”, “at”, “Hi”, “is”, “from”, “that”}; Let’s …
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Python Tuple : Append , Insert , Modify & delete elements in Tuple
In this article we will discuss how to Append, Insert, Replace and Delete elements from a tuple in python. In Python, tuples are immutable i.e. once created we can not change its contents.  But sometimes we want to modify the existing tuple, in that case we need to create a new tuple with updated elements only …
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C++11 / C++14 : ‘delete’ keyword and deleted functions with Use Cases | Examples
In this article we will discuss how to use delete keyword with functions and its use cases. Deleting Functions using ‘delete’ keyword In C++11 a new feature of keyword delete is introduced. Now we can apply the delete keyword to functions to make them uncallable. void someFunction() = delete ; Its practical use cases are, …
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Python : How to delete a directory recursively using shutil.rmtree()
In this article we will discuss how to delete an empty directory and also all contents of directory recursively i.e including contents of its sub directories. Delete an empty directory using os.rmdir() Python’s os module provide a function to delete an empty directory i.e. Advertisements os.rmdir(pathOfDir) Path of directory can be relative or absolute. It …
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Delete elements from a Numpy Array by value or conditions in Python
In this article we will discuss different ways to delete elements from a Numpy Array by matching value or based on multiple conditions. Remove all occurrences of an element with given value from numpy array Suppose we have a numpy array of numbers i.e. Advertisements # Create a numpy array from a list arr = …
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Python: How to delete specific lines in a file in a memory-efficient way?
In this article, we will discuss different ways to delete specific lines from a file either by line number, by matching content or based on any custom logic. In Python, there is no direct API to delete lines or text from the middle of a file. Therefore, in this article, we will follow an approach …
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Reset AUTO_INCREMENT after Delete in MySQL
Sometimes the most recent entries get deleted from our table. After the rows are deleted, try to insert some rows. We can observe a gap in the number_values of the auto_increment column, which is ok in many cases. However, many times the requirement is to reset the auto_increment to maintain the sequence. Well, there is …