How do you know that your class needs a virtual destructor?
- 5 Answers
- 9983 Views
- Lucent, I also Faced
- E-Mail Answers
Answers were Sorted based on User's Feedback
Answer / guest
If your class has at least one virtual function, you should
make a destructor for this class virtual. This will allow
you to delete a dynamic object through a baller to a base
class object. If the destructor is non-virtual, then wrong
destructor will be invoked during deletion of the dynamic
object.
| Is This Answer Correct ? | 8 Yes | 1 No |
Answer / abc
When We Declare a Virtual Function In Base Class.
The Base Class Pointer Can Point To Derived Class objects.
And If we Try To Delete The Base Class Pointer ,it will Call
the base Class Destructor(Which Is Wrong).
To Handle Such Scenario,The Base Class Destructor need To
Be Declared As Virtual(Which Makes All The Derived Class
Destructors Virtual).Now The Base Class Pointer Will Call
The Respective Destructors(Ofcourse,It Is Decided at Run
Time.With The Virtual Mechanism.)
| Is This Answer Correct ? | 3 Yes | 0 No |
Answer / som shekhar
If we are deriving from the base class and the base class
consist of some virtual function , then in this case the
base destructor should be virtual.
if you do some thing like this :
base* b = new derived;
delete b;
In this case if base destructor is NOT VIRTUAL then only
base destructor is called and derived destructor wont be
called resulting into memory leak.
But if the base destructor is virtual then derived class
destructor and base destructor both will be called.
| Is This Answer Correct ? | 1 Yes | 0 No |
Answer / melos
If the class will be derived from and it will need a virtual
destructor so that the destructor of the derived class will
be invoked if it referenced using the pointer to the base class.
| Is This Answer Correct ? | 1 Yes | 1 No |
Answer / nishikant sahu
If programmer intended to act the class as a BASE class
somewhere then it is rule of thumb or good programming that
you have to have declare your constructor virtual.
| Is This Answer Correct ? | 3 Yes | 6 No |
How one would use switch in a program?
What is iterator c++?
can any one help to find a specific string between html tags which is changed to a sting.. weather.html looks (for location) is <location>somewhere</location> #include <iostream> #include <fstream> #include <string> using namespace std; string find_field(string myPage,string); int main (void) { string page, line, location, temperature; ifstream inputFile("weather.xml"); while(getline(inputFile, line)) { page.append(line); line.erase(); } // Now page is a string that contains the whole xml page // Here you need to write something that finds and // extracts location and temperature from the XML // data in the string page and stores them in // the strings location and temperature respectively location=find_field(page,"location"); temperature=find_field(page,"temp_c"); cout << "Location: "<<location << endl; cout << "Temperature: " << temperature << endl; system("pause"); } string find_field(string myPage,string find_string){ int temp=myPage.find(find_string); if(temp!=string::npos) { cout << "Match found at " << temp << endl; } return "found?"; } ///
Explain the isa and hasa class relationships.
What is a wchar_t in c++?
Read the following program carefully and write the output of the program. Explain each line of code according to given numbering. #include <stdio.h> #include <unistd.h> #include <stdlib.h> #include <errno.h> 1……………… int main (void) { pid_t pid; 2………………………… pid = fork(); 3…………………………. if (pid > 0) { int i; 4………………………… for (i = 0; i < 5; i++) { 5………………… …………… printf(" I AM VU : %d\n", i); 6………………… …………… sleep(1); } exit(0); } 7………………… ……… else if (pid == 0) { int j; for (j = 0; j < 5; j++) { 8……………………………… printf(" I have no child: %d\n", j); sleep(1); } _exit(0); } else { 9………………………………fprintf(stderr, "can't fork, error %d\n", errno); 10……………… … ………… exit (EXIT_FAILURE); } }
reading material is provided 3 books for c++ if u need more do let me know thnx i hve lots of material do let me know if u want it
What is the full form of india?
Can I uninstall microsoft c++ redistributable?
What is std :: endl?
Why is c++ awesome?
What is c++ w3school?
STL 
