StackOverflow2013

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plurals

PO
primarykey
Id
8546339
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
2
CommunityOwnedDate
CreationDate
2011-12-17T16:55:58.380
FavoriteCount
0
LastActivityDate
2011-12-17T17:04:12.267
LastEditDate
2011-12-17T17:04:12.267
LastEditorUserId
19563
OwnerUserId
19563
ParentId
8546243
PostTypeId
2
Score
7
ViewCount
0
LastEditorDisplayName
text
Body
No, the code that you have posted does not exhibit undefined behavior but attempting to read <code>*p</code> would. Also, depending on the alignment requirements of <code>int</code> and <code>short</code>, the result of the cast may be unspecified and irreversable (see 5.2.10 [expr.reinterpret.cast] / 7). See ISO/IEC 14882:2011 3.10 [basic.lval] / 10: <blockquote> If a program attempts to access the stored value of an object through a glvalue of other than one of the following types the behavior is undefined: <ul> <li>the dynamic type of the object,</li> <li>a cv-qualified version of the dynamic type of the object,</li> <li>a type similar (as defined in 4.4) to the dynamic type of the object,</li> <li>a type that is the signed or unsigned type corresponding to the dynamic type of the object,</li> <li>a type that is the signed or unsigned type corresponding to a cv-qualified version of the dynamic type of the object,</li> <li>an aggregate or union type that includes one of the aforementioned types among its elements or non-static data members (including, recursively, an element or non-static data member of a subaggregate or contained union),</li> <li>a type that is a (possibly cv-qualified) base class type of the dynamic type of the object,</li> <li>a char or unsigned char type.</li> </ul> </blockquote> The object that you are trying to access is a <code>short</code> and <code>*p</code> is a glvalue of type <code>int</code> which doesn't meet any of the above descriptions.
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1. This table or related slice is empty.
PostParentId
1. POConversion between short* to int*
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1. PTAnswer
UserLastEditorUserId
1. USCB Bailey
UserOwnerUserId
1. USCB Bailey
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1. POConversion between short* to int*
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1. VO
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3. VO
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CommentsPostId
1. COIf I go from `int*` to `short*`, would it still be undefined to access value pointed by `int*` using `short*`? I can only use a `char*` right?
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 USuser1086635
2. CO@user1086635: Yes, you are correct. The logic and reasoning are exactly the same.
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 USCB Bailey

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