What is the difference between new and malloc

Above differences already tells the advantages of new and delete operators over malloc and free functions. Bit slower does not mean that we should not use new operator for memory allocation. However, if we are very cautious about the performance, we can use malloc functions for memory allocation for inbuilt data type i. Interviewer: Ok, tell me one situation where new and delete is indispensable.

Provided that enough memory is available, the new operator initializes it and thereafter works to return the newly allocated and formed memory to the pointer variable. A new should always be matched with a delete.

This operator is used for dynamic memory allocation, object construction, and destruction. The memory is allocated for objects from a pool known as the free store. It works much faster than malloc since it is an operator and not a function. Malloc has to match with a free and new with a delete to make it work properly. The two should never get interchanged. A new is much more advanced than a malloc as it requires no prior knowledge of the size of the operator to allocate space for memory but a malloc function requires it.

A malloc function cannot call the constructor of an object a new operator is capable of doing so. Although a malloc is much faster than new on average the speed may vary depending on the individual invocation. Now, we will see the differences between the new operator and the malloc function. In the above statements, we are declaring an integer pointer variable. The above statement will allocate the memory for an integer variable in a heap, and then stores the address of the reserved memory in 'p' variable.

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Viewed k times. Improve this question. Community Bot 1 1 1 silver badge. MrDatabase MrDatabase See also my detailed answer here. Add a comment. Active Oldest Votes. Returns a fully typed pointer.

Are called with Type-ID compiler calculates the size. Has a version explicitly to handle arrays. Reallocating to get more space not handled intuitively because of copy constructor. Returns NULL on failure. Must specify the size required in bytes. Allocating array requires manual calculation of space.

Reallocating larger chunk of memory simple no copy constructor to worry about. No way to splice user code into the allocation sequence to help with low memory. Improve this answer. Can someone edit to elaborate regarding the "Free Store" as opposed to the heap? A process' heap is a well-known language-independent? Neither has anything to do with the language concept known as "heap" or the os concept of "processes heap".