Explanation of dynamic Establishment and release of objects in C++ and the difference between object Array and pointer Array

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Catalogue

Overview

Dynamic establishment and release of objects

Case

Object array vs pointer array

Object array

Pointer array

Overview

Through the dynamic establishment and release of objects, we can improve the utilization of memory space.

Dynamic establishment and release of objects

New operator: dynamically allocating memory

Delete operator: freeing memory

When we allocate memory dynamically with the new operator, a pointer to the new object is returned. We can access the object through this address. For example:

Int main () {Time * pt1 = new Time (8,8,8); pt1-> show_time (); delete pt1; / / release object return 0;}

Output result:

8:8:8

When we no longer need the object created by new, release it with the delete operator.

Case

Box class:

# ifndef PROJECT1_BOX_H#define PROJECT1_BOX_Hclass Box {public: / / member object double length; double width; double height; / / member function Box (); / No parameter construction Box (double h, double w, double l); / / parameter construction ~ Box (); / / destructor double volume () const; / / constant member function}; # endif / / PROJECT1_BOX_H

Box.cpp:

# include # include "Box.h" using namespace std;Box::Box (): height (- 1), width (- 1), length (- 1) {} Box::Box (double h, double w, double l): height (h), width (w), length (l) {cout