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C: How does macro function works as compare to normal function ?

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What all things need to be taken care while writing macro function which has multiple lines ?

posted May 22, 2016 by Vikram Singh

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1 Answer

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Hi Vikram, I think you should read this article to know your answer where differences between macro and normal functions are explained very well.
Link : http://tech.queryhome.com/50776/difference-between-macro-and-function
Author : Salil Agrawal and for your second ques in "explanation section"
For writing multiple line Macros,

each statement ends with “\”

example :

You use \ as a line continuation escape character.

#define swap(a, b) {               \
                       (a) ^= (b); \
                       (b) ^= (a); \
                       (a) ^= (b); \
                   }

follow these links to know more rules while writing multiple line macros
1.http://www.oualline.com/books.free/style/c06.html
2.http://www.geeksforgeeks.org/multiline-macros-in-c/

answer May 23, 2016 by Shivam Kumar Pandey
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Is it possible to call a Python macro from ctypes? For example, Python 3.3 introduces some new macros for querying the internal representation of strings:
http://www.python.org/dev/peps/pep-0393/#new-api

So I try this in 3.3:

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AttributeError: python3.3: undefined symbol: PyUnicode_MAX_CHAR_VALUE
...