how to use malloc() in C++ [closed]

Question

How to use malloc() in C++ program?

Answer 1

You shouldn't use malloc in C++. You should use new instead. In fact, you probably shouldn't be using new as well (for most basic programming in C++). But still a basic example is declaring an array: int* array = new int[n]. This will allocated room for n integers and return a pointer to the address of the first one. Please note that you must explicitly call delete[] to free this allocation.

Answer 2

Mostly, you shouldn't use it at all. C++ provides the new and delete operators for memory management, and even delete can be largely avoided by using smart pointers such as boost::shared_ptr from the Boost library.

Example:

// malloc
Duck* duck = (Duck*)malloc(sizeof(Duck));

// new
Duck* duck = new Duck();

Also note that, if the Duck class has a non-trivial constructor, then new is almost mandatory. (Almost, because you could use malloc with placement new, but that would be getting us off the main track).