auto_ptr

Hi,

I have a few questions regarding this auto_ptr

1) I should only use auto_ptr within a function??

2) Can i use auto_ptr<int> or auto_ptr<SomeClass> in a class?
example:

Code:

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class Test
{
private:
auto_ptr<int> ptrData;
}

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If not why?

3)auto_ptr<std::vector> vec1 for example, why is it after copying such as
auto_ptr<std::vecotr> vec2(vec1), vec2 becomes unmodifiable? how to get around this?

Quote:

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Originally Posted by mce

3)auto_ptr<std::vector> vec1 for example, why is it after copying such as
auto_ptr<std::vecotr> vec2(vec1), vec2 becomes unmodifiable? how to get around this?

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You probably mean to say that vec1 no longer owns the vector. Basically, auto_ptr has unusual copy semantics...

Quote:

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Originally Posted by mce

2) Can i use auto_ptr<int> or auto_ptr<SomeClass> in a class?

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... so if you have an auto_ptr member in a class, and you don't disable copying, you'll have to worry about the unusual copy semantics that objects of your class will have...

Quote:

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Originally Posted by mce

1) I should only use auto_ptr within a function??

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... hence using an auto_ptr in the way you would use Boost's scoped_ptr is a way to keep things simple.

Note that the 2011 version of the C++ standard introduces std::unique_ptr and deprecates std::auto_ptr (because of the problems that it can cause, and the fact that unique_ptr can replace it for what it is useful for).