StackOverflow2013

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PO
primarykey
Id
12775592
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0
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0
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0
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CreationDate
2012-10-08T05:04:05.313
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0
LastActivityDate
2013-06-05T13:15:54.560
LastEditDate
2013-06-05T13:15:54.560
LastEditorUserId
97438
OwnerUserId
543915
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12774881
PostTypeId
2
Score
2
ViewCount
0
LastEditorDisplayName
text
Body
First, a couple of points: <ol> <li>Macros are simply functions that receive as input [literals, symbols, or collections of literals and symbols], and output [literals, symbols, or collections of literals and symbols]. Arguments are never functions, so you could never directly check the function the symbol maps to.</li> <li><code>(call-special #(println % " World") "Hello")</code> contains reader macro code. Since reader macros are executed before regular macros, you should expand this before doing any more analysis. Do this by applying <code>(read-string "(call-special #(println % \" World\") \"Hello\")")</code> which becomes <code>(call-special (fn* [p1__417#] (println p1__417# "world")) "Hello")</code>.</li> </ol> While generally speaking, it's not obvious when you would want to use something when you should probably use alternative methods, here's how I would approach it. You'll need to call <code>macroexpand-all</code> on <code>a</code>. If the code eventually becomes a <code>(fn*)</code> form, then it is guaranteed to be a function. Then you can safely emit (~a ~b). If it macroexpands to eventually be a symbol, you can also emit <code>(~a ~b)</code>. If the symbol wasn't a function, then an error would throw at runtime. Lastly, if it macroexpands into a list (a function call or special form call), like <code>(println ...)</code>, then you can emit code that uses the thread macro <code>-></code>. You can also cover the cases such as when the form macroexpands into a data structure, but you haven't specified the desired behavior.
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1. POIs the Macro argument a function?
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1. USMarc
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1. USbmillare
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