Programming Lecture 39: Pointers, References, and Memory Allocation, Slides of Computer Programming

Download Programming Lecture 39: Pointers, References, and Memory Allocation and more Slides Computer Programming in PDF only on Docsity! Introduction to Programming Lecture 39 Docsity.com Copy Constructor Docsity.com  Void Pointer  Pointer to an Integer  Pointer to a Character  Pointer to a Float  Pointer to Objects Docsity.com References Docsity.com Docsity.com Native Operator  new  delete Docsity.com int *p ; p = new int ; delete p ; Dynamic Memory Allocation Docsity.com int *p ; p = new int [ 10 ] ; delete [ ] p ; Dynamic Memory Allocation Docsity.com Assignment Docsity.com int i = 0 ; //Initialization int i ; i = 0 ; //Assignment Docsity.com Matrix m1 , m2 ; …… m2 = m1 ; //Assignment Statement Docsity.com 0xefffdad0 mx Pointing to the same region in memory int *m of m1 0xefffdad0 int *m of m2 Docsity.com 0xefffdad0 mx Pointing to the same region in memory int *m of m1 0xefffdad0 int *m of m2 Docsity.com Copy Constructor Docsity.com Matrix ( Matrix & ) ; Docsity.com Example class String { char * c ; public : void copy ( char * s ) ; String ( char * data ) ; void print ( ) ; // etc. } ; Docsity.com Example String s1 ( “test1” ) ; String s2 = s1 ; s1.copy ( “this is a test” ) ; s2.print ( ) ; Docsity.com Rules For dynamic memory allocation 1. Define copy constructor 2. Write assignment operator 3. Provide destructor Docsity.com What have we covered today  Review of pointers – Dynamic memory allocation  new  Delete  For memory allocation in classes we must provide – Constructor – Copy constructor – Assignment operator – destructor Docsity.com