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Dynamic Memory Management in C++: Allocate, Reallocate and Deallocate Memory like a Pro

published 390 days, 3 hours ago posted by DhruvDhruv 399 days, 1 hour, 15 minutes ago
Monday, January 30, 2023 12:40:24 PM GMT Saturday, January 21, 2023 2:25:44 PM GMT

The blog post on "Dynamic Memory Allocation in C++" explains how to allocate and deallocate memory dynamically in C++. Dynamic memory allocation is a feature in C++ that allows for the creation of variables and arrays whose size is not known until runtime. This is in contrast to static memory allocation, where the size of variables and arrays is fixed at compile-time.

The post begins by introducing the concept of memory allocation in C++ and explaining the difference between static and dynamic memory allocation. It then goes on to cover the four main functions used for dynamic memory allocation in C++: - malloc() - calloc() - realloc() - free().

The malloc() function is used to allocate a block of memory of a specified size and returns a pointer to the first byte of the allocated memory. The calloc() function is similar to malloc() but it also initializes the allocated memory to zero. The realloc() function is used to change the size of a previously allocated memory block, and it returns a pointer to the first byte of the newly allocated memory block. The free() function is used to deallocate memory that was previously allocated with malloc(), calloc() or realloc().

The post also covers the new operator, which is an alternative to the C-style memory allocation functions and it is more elegant way of allocating memory. The new operator returns a pointer to the newly allocated memory and it automatically calls the constructor of the object. The post also covers the delete operator, which is the counterpart of new operator, it deallocates the memory and calls the destructor of the object.

The post concludes by discussing some of the common pitfalls of dynamic memory allocation, such as memory leaks, and how to avoid them. It also notes that dynamic memory allocation can be a powerful tool for creating flexible and efficient code, but it can also make the code more complex and harder to read and debug if not used carefully.

Overall, the post provides a comprehensive introduction to the use of dynamic memory allocation in C++, covering the basics of memory allocation and deallocation using C-style functions and new and delete operator, as well as more advanced topics such as pitfalls of dynamic memory allocation and how to avoid them. It also highlights the benefits and potential pitfalls of using dynamic memory allocation in C++ programming.

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