Doubt regarding destructors

This is a discussion on Doubt regarding destructors within the C++ Programming forums, part of the General Programming Boards category; I have the following class hierarchy: Shape <- Shape3d <- Sphere And I am trying to run the following code: ...

  1. #1
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    Doubt regarding destructors

    I have the following class hierarchy:

    Shape <- Shape3d <- Sphere

    And I am trying to run the following code:

    Code:
    Shape *s = (Shape3d *) new Sphere();
    ...
    delete s;
    I have destructors in place with cout statements. I can see that only Shape destructor is called. How do I ensure that Sphere, Shape3d and Shape destructors are called?

    I am using Turbo C++ IDE.

  2. #2
    C++まいる!Cをこわせ! Elysia's Avatar
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    Make the desctructors virtual.
    Furthermore, do not cast the return of new! This is complete unnecessary.
    Also recommend upgrading your IDE if you can. Turbo C++ is so outdated and non-standard.
    Visual Studio (Express) is a very good IDE with a compiler and debugger.
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    io.h certainly IS included in some modern compilers. It is no longer part of the standard for C, but it is nevertheless, included in the very latest Pelles C versions.
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    You mean it's included as a crutch to help ancient programmers limp along without them having to relearn too much.

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  3. #3
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    Quote Originally Posted by Elysia View Post
    Furthermore, do not cast the return of new! This is complete unnecessary.
    And even if you do need to use casts elsewhere in the code, don't use C-style casts. Use the proper C++ casts: static_cast, dynamic_cast, const_cast or reinterpret_cast.
    "I am probably the laziest programmer on the planet, a fact with which anyone who has ever seen my code will agree." - esbo, 11/15/2008

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    Algorithm Dissector iMalc's Avatar
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    Ooh, I found the problem!
    Quote Originally Posted by karishma View Post
    I am using Turbo C++ IDE.
    You probably don't want to do that!
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    Advice: Take only as directed - If symptoms persist, please see your debugger

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