StackOverflow2013

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plurals

PO
primarykey
Id
20786077
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
1
CommunityOwnedDate
CreationDate
2013-12-26T13:55:17.490
FavoriteCount
0
LastActivityDate
2013-12-26T15:56:56.517
LastEditDate
2013-12-26T15:56:56.517
LastEditorUserId
2404501
OwnerUserId
2404501
ParentId
20785779
PostTypeId
2
Score
0
ViewCount
0
LastEditorDisplayName
text
Body
Can I assume you want the empty definition and the <code>1</code> definition to be equivalent with the <code>0</code> is the different one? I'm pretty sure that question already exists on stackoverflow, but I can't find it. Here's a usenet thread on the same topic: <a href="https://groups.google.com/d/msg/comp.lang.c/jkI2vz8ZxmE/1-kOKCQ2MrwJ" rel="nofollow">https://groups.google.com/d/msg/comp.lang.c/jkI2vz8ZxmE/1-kOKCQ2MrwJ</a> Several answers are given there. The cleverest one looks like: <pre><code>#if -CONSTANTNAME+1 == 1 ... the "no CONSTANTNAME" branch #else ... the "yes CONSTANTNAME" branch #endif </code></pre> If <code>CONSTANTNAME</code> is empty, <code>-+1 == 1</code> => false. If it's <code>1</code>, <code>-1+1 == 1</code> => false. If it's <code>0</code>, <code>-0+1 == 1</code> => true. If it's not defined, the default cpp replacement for unrecognized tokens applies, and that's a <code>0</code> so it's true. UPDATE If you want 3 branches, you can still use the <code>-FOO+0 == 1</code> test and add an extra test like <code>FOO+0==0</code>. Look at the results you can get: <pre><code>Value of `FOO` `-FOO+1==1` `FOO+0==0` empty string false true 1 false false 0 true true </code></pre> If the 4th case, macro not defined, is interesting, it must be tested with <code>#ifdef FOO</code> or <code>defined(FOO)</code> since it is otherwise indistinguishable from <code>0</code>. Sample code: <pre><code>#if !defined(FOO) ... handle undef #elif -FOO+1 == 1 ... handle 0 #elif FOO+0 == 0 ... handle empty #else ... handle 1 #endif </code></pre>
Tags
Title
singulars
PostAcceptedAnswerId
1. This table or related slice is empty.
PostParentId
1. PODistinguish empty macro definition from 0
 singulars
 PostTypePostTypeId
 PTQuestion
PostTypePostTypeId
1. PTAnswer
UserLastEditorUserId
1. USWumpus Q. Wumbley
UserOwnerUserId
1. USWumpus Q. Wumbley
plurals
PostLinksPostIdRelatedPostId
1. This table or related slice is empty.
PostLinksRelatedPostIdPostId
1. This table or related slice is empty.
PostsAcceptedAnswerId
1. This table or related slice is empty.
PostsParentIdCreationDate
1. This table or related slice is empty.
VotesPostIdCreationDate
1. This table or related slice is empty.
CommentsPostId
1. COI need to follow three different branches for the three cases listed in question
 singulars
 PostPostId
 PO
 UserUserId
 USefa

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