StackOverflow2013

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plurals

PO
primarykey
Id
10234230
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
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0
CommunityOwnedDate
CreationDate
2012-04-19T18:14:36.590
FavoriteCount
0
LastActivityDate
2012-04-19T18:22:59.860
LastEditDate
2012-04-19T18:22:59.860
LastEditorUserId
151292
OwnerUserId
151292
ParentId
10234172
PostTypeId
2
Score
12
ViewCount
0
LastEditorDisplayName
text
Body
You need some indirection. With C99: <pre><code>#define NEED3ARGS(a1,a2,a3) ( "[" #a1 " + " #a2 " + " #a3 "]" ) #define INVOKE_NEED3ARGS(...) NEED3ARGS(__VA_ARGS__) #define MULTIARG() ARG1, ARG2, ARG3 INVOKE_NEED3ARGS( MULTIARG() ) </code></pre> (C99 isn't strictly required; you can replace the variadic macro with a fixed-arity macro.) If you need to compile your source using Visual C++, you'll need even more indirection (because of <a href="http://connect.microsoft.com/VisualStudio/feedback/details/380090/variadic-macro-replacement">a compiler bug</a>): <pre><code>#define NEED3ARGS(a1,a2,a3) ( "[" #a1 " + " #a2 " + " #a3 "]" ) #define INVOKE_NEED3ARGS_(...) NEED3ARGS __VA_ARGS__ #define INVOKE_NEED3ARGS(...) INVOKE_NEED3ARGS_((__VA_ARGS__)) #define MULTIARG() ARG1, ARG2, ARG3 INVOKE_NEED3ARGS( MULTIARG() ) </code></pre> <hr> As for why indirection is needed: a macro argument is not evaluated and macro-replaced until it is substituted into the replacement list. So, when you try <code>NEED3ARGS(MULTIARG())</code>, <code>MULTIARG()</code> will not be evaluated until after macro invocation has begun, so it's treated as a single argument. The <code>INVOKE_NEED3ARGS</code> macro ensures that its arguments are completely evaluated before <code>NEED3ARGS</code> is invoked. The <code>__VA_ARGS__</code> is substituted by the macro-replaced arguments to <code>INVOKE_NEED3ARGS</code>, which is <code>ARG1, ARG2, ARG3</code>, then <code>NEED3ARGS</code> is invoked with those arguments.
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1. POIs it possible to a Macro evaluate multiple arguments to another?
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1. USJames McNellis
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1. USJames McNellis
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1. POIs it possible to a Macro evaluate multiple arguments to another?
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