StackOverflow2013

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Id
20100580
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0
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0
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2013-11-20T15:52:57.763
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2013-11-20T17:58:32.420
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2013-11-20T17:58:32.420
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204847
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204847
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20100360
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2
Score
6
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0
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text
Body
(Note that <code>class</code> isn't a valid variable name, since it's a keyword. I'll call it <code>c</code> instead). <blockquote> Is it safe to delete the pointer after dynamic_casting? </blockquote> Yes; but beware that both pointers are invalid after deleting the object that they point to. You can't use either pointer value afterwards. <blockquote> In general how dynamic_cast actually works? </blockquote> It converts a pointer or reference to a class type into a pointer or reference to a different class type, with a run-time check that the conversion is valid. In this case, the cast will succeed (giving a valid pointer) if <code>BaseClass</code> is the same as, or a base class of, the dynamic type of the object. It will fail (giving a null pointer) otherwise. If you were casting <code>*c</code> to a reference type, then failure would cause an exception (<code>std::bad_cast</code>), since there is no such thing as a null reference. <blockquote> does it work like a copy constructor? </blockquote> No. Copy constructors are for copying the object. This isn't copying it, just changing the type of a pointer that points to it. A copy would look like <pre><code>BaseClass bc = *c; </code></pre> Note that the type of <code>bc</code> is <code>BaseClass</code>, not the type of <code>c</code> (which is presumable a class derived from <code>BaseClass</code>); this is known as "slicing", since the derived part of the object is "sliced off" and not copied.
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1. POIs it safe to delete the pointer after dynamic_casting?
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1. USMike Seymour
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1. USMike Seymour
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1. POIs it safe to delete the pointer after dynamic_casting?
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