[Boost-users] [preprocessor] have macro do different things based on structure of its argument

Subject: [Boost-users] [preprocessor] have macro do different things based on structure of its argument
From: Nathan Ridge (zeratul976_at_[hidden])
Date: 2011-03-02 04:11:07

Hello,
 
I would like to write a macro MY_MACRO(x) that does different things based on
the structure of its input, e.g. something different for each of the following
forms:
 
MY_MACRO(x)          // a single token
MY_MACRO((x, y))     // a parenthesized list of two tokens
MY_MACRO((x, y, z))  // a parenthesized list of three tokens
MY_MACRO(x y)        // two tokens
MY_MACRO(x y z)      // three tokens
MY_MACRO(x = y)      // three tokens with the second one being something specific
 
Are any of these possible?
 
Thanks,
Nate.