Differences between malloc/free and new/delete in Linux

Since malloc/free is a library function, not an operator, they cannot execute constructor and destructor, but are only responsible for allocating memory. 1. malloc and free are standard library functions of C ++/C, and new/delete are operators of C ++. They can be used to apply for dynamic memory and release memory. 2. For non-Internal data objects, the use of maloc/free alone cannot meet the requirements of dynamic objects. The constructor must be automatically executed when the object is created, and the Destructor must be automatically executed before the object is extinct. Since malloc/free is a library function rather than an operator and is not controlled by the compiler, it is impossible to impose the tasks of executing constructor and destructor on malloc/free. 3. Therefore, the C ++ language requires a new operator capable of dynamic memory allocation and initialization, and a delete operator capable of cleaning and releasing memory. Note that new/delete is not a database function. 4. C ++ programs often call C functions, while C Programs can only use malloc/free to manage dynamic memory. New is an operator, and what "+", "-", "= "... Has the same status. malloc is a memory allocation function for you to call. New is a reserved word and does not require header file support. malloc requires support from the header file library function. New creates an object, and malloc allocates a piece of memory. You can use a new object as a common object to access it using a member function. Do not directly access its address space. Malloc is allocated with a memory area, which can be accessed with pointers and moved inside.