> For the complete documentation index, see [llms.txt](https://abhyas-kanaujia.gitbook.io/lb-dsa-notes-and-homework-abhyas/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://abhyas-kanaujia.gitbook.io/lb-dsa-notes-and-homework-abhyas/18-static-and-dynamic-allocation/bonus/new-vs-malloc.md).

# new vs malloc

| new                                                                                                     | malloc                                                                                                       |
| ------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------ |
| `new` calls the constructor after allocating space. Smart.                                              | `malloc` only allocates enough space and its our job to call the constructor to initialize the object.       |
| `new` is an operator like `+` `sizeof` etc. So this will get compiled down to a small fragment of code. | Its a library function. This will be an overhead and will make the size of the executable relatively larger. |
| Returns appropriate pointer.                                                                            | Always returns `void *`                                                                                      |
| On error it throws an `bad_alloc` exception. So error handling comes naturally.                         | On error simply returns `NULL`. So its our job to perform NULL checking and throw appropriate exceptions.    |
| Size requirement is calculated by compiler.                                                             | Size requirement are to be specified explicitely.                                                            |
| Cannot be resized.                                                                                      | Can be resized using `realloc()`.                                                                            |

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<summary>References</summary>

* **new operator (C++). (2022). Retrieved 24 May 2022, from <https://docs.microsoft.com/en-us/cpp/cpp/new-operator-cpp?view=msvc-17>**
* **malloc() vs new - GeeksforGeeks. (2010). Retrieved 24 May 2022, from <https://www.geeksforgeeks.org/malloc-vs-new/>**

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