What is the difference between malloc/free and new/delete in C++

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Problem description

In C++, it is generally possible to use malloc/free and new/delete to dynamically request and free memory.

Malloc/free

The free () function is used to free the memory allocated by the malloc () function and is called in pairs with malloc ().

The argument of the free () function is of pointer type. When releasing, you need to determine whether the pointer is NULL or not.

The free () function releases memory and does not call the destructor of the pointer object.

Free () and malloc () are operations on memory space

New/delete

Delete is used to free memory allocated by new, which is called in pairs with new

Delete does not need to judge whether the following object is NULL or not

Delete not only frees memory, but also calls the object's destructor.

Delete and new are operations on objects and are operators

problem

If you forget to call delete or because it is not called in other ways, the memory allocated in the heap will not be automatically reclaimed, resulting in a memory leak; now you can generally choose to use smart pointers, which are now supported by the cantileaked 11 standard.

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