More preprocessor wizardy: strings
Posted by: nico on 
Aug 25th, 2009 | 
Filed under: C++, Programming
No preprocesor wizard should go out of his house without the always useful string maker. Let’s say you’re trying to create a class with some sort of pseudo type-system (*):
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Why would you type ALL that when you can make a simple macro, MK_CLASS, like this:
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MK_CLASS( FooBar )
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/* Other methods */
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};
Problem is, this will only print “Name”:
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#define MK_CLASS( Name ) \
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class Name { public: \
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const char *get_name(){ return "Name"; }
Well, it’s an easy fix, just prepend # to your string, like this:
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#define MK_CLASS( Name ) \
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class Name { public: \
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const char *get_name(){ return #Name; }
Or use this nice string maker:
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#define MK_STR(str) #str
As usual, use the preprocesor at your own risk.
(*) Yeah, I know, OO purists will try to beat me to death for this, but it actually has some uses. I’ve found it to be a specially good solution when working with low level protocols.
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