Solved

static and virtual

Posted on 2004-10-15
1
300 Views
Last Modified: 2013-11-18
what the virtual means in the following context
a) class NewClass : public virtual oldclass

b) class AnotherClass
   {
    public:
      virtual void put(char*)
what the static means in the following context
a) class thirdclass
private:
static int size;

b) class lastclass
{
public:
   static bool isvalid(int day, int month, int year);

0
Comment
Question by:rmvprasad
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
1 Comment
 
LVL 86

Accepted Solution

by:
jkr earned 200 total points
ID: 12320175
>> what the virtual means in the following context
>>a) class NewClass : public virtual oldclass

This means that 'oldclass' is a virtual base class, so the compiler will ensure that only one copy of the subobject 'oldclass' is included

>>b) class AnotherClass
>>  {
>>   public:
>>     virtual void put(char*)

This declares 'put()' as a virtual member function. A virtual function is a member function that you expect to be redefined in derived classes. When you refer to a derived class object using a pointer or a reference to the base class, you can call a virtual function for that object and execute the derived class's version of the function.

>>what the static means in the following context
>>a) class thirdclass
>>private:
>>static int size;
>>b) class lastclass
>>{
>>public:
>>  static bool isvalid(int day, int month, int year);

In both cases, the static keyword specifies that one copy of the member is shared by all the instances of the class. When modifying a member function in a class declaration, the static keyword specifies that the function accesses only static members. Also, static members are the only members that can be used without actually referring to a certain instance of that class.

0

Featured Post

On Demand Webinar: Networking for the Cloud Era

Did you know SD-WANs can improve network connectivity? Check out this webinar to learn how an SD-WAN simplified, one-click tool can help you migrate and manage data in the cloud.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Preface This is the third article about the EE Collaborative Login Project. A Better Website Login System (http://www.experts-exchange.com/A_2902.html) introduces the Login System and shows how to implement a login page. The EE Collaborative Logi…
VM backup deduplication is a method of reducing the amount of storage space needed to save VM backups. In most organizations, VMs contain many duplicate copies of data, such as VMs deployed from the same template, VMs with the same OS, or VMs that h…
The viewer will learn how to pass data into a function in C++. This is one step further in using functions. Instead of only printing text onto the console, the function will be able to perform calculations with argumentents given by the user.
The viewer will learn the basics of jQuery, including how to invoke it on a web page. Reference your jQuery libraries: (CODE) Include your new external js/jQuery file: (CODE) Write your first lines of code to setup your site for jQuery.: (CODE)

617 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question