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Dec 12th, 2007

Is there a way to prevent creating objects on heap?

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Yesterday I saw a question that was asking to prevent creating objects on heap.

After some thoughts, I came out the following:

C++ Syntax (Toggle Plain Text)
class Foo
{
public:
    Foo(const Foo& f) {}
    static Foo getAnInstance()
    {
        return Foo();
    }
private:
    Foo() {}
};
class Foo
{
public:
    Foo(const Foo& f) {}
    static Foo getAnInstance()
    {
        return Foo();
    }
private:
    Foo() {}
};

But this can only guarantee the first object is on stack and it can’t go further because there is a public copy ctor.

I haven't seen the point of the question, but it's fun to think about; so my question: Is there a way to do so?

jaux

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Dec 12th, 2007

Re: Is there a way to prevent creating objects on heap?

methods of a class are never ever on the stack -- only data objects go there.

C++ Syntax (Toggle Plain Text)
int main()
{
    Foo f; // object f goes on the stack, but not the methods of that object.
}
int main()
{
    Foo f; // object f goes on the stack, but not the methods of that object.
}

Ancient Dragon

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Dec 12th, 2007

Re: Is there a way to prevent creating objects on heap?

Thank you, Dragon. Does that mean that, on our side (not the client side), to restrict the location of object creation is pointless? I mean that it's client's responsibility to determine where his/her objects should be located.

Last edited by jaux; Dec 12th, 2007 at 9:07 pm. Reason: clarification

jaux

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Dec 12th, 2007

Re: Is there a way to prevent creating objects on heap?

see: More Effective C++: 35 More Ways to Improve Your Programs and Designs (Scott Meyers)
ITEM 27. Requiring or Prohibiting Heap-Based Objects.
and http://www.aristeia.com/BookErrata/M...ts_frames.html

vijayan121

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Dec 12th, 2007

Re: Is there a way to prevent creating objects on heap?

Thank you, vijayan121. I am going to take a look at the item.

jaux

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Dec 12th, 2007

Re: Is there a way to prevent creating objects on heap?

I've gotten the point and solution

Thank you guys!

jaux

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