Thread: Preprocessor Question/s

  1. #1
    Registered User awsdert's Avatar
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    Preprocessor Question/s

    I tried googling it but didn't notice any results that would've answered my question (even tried looking at Wikipedia)

    I wanted to know if there is any preprocessor commands/queries that naturally expand across more than one line (and I don't mean #if etc which if you dis-include the code are still naturally one line)

    As far as I can think of there are none
    Code:
    #undef <ID>
    #define <ID>
    #ifdef <ID>
    #if <EXPR>
    #elif <EXPR>
    #else
    #endif
    #pragma <CC_ACTION>
    #include <INC>
    #import <INC>
    I'm asking because it determines the complexity of my project

  2. #2
    C++ Witch laserlight's Avatar
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    Would you count the use of \ to extend a #define macro across multiple lines?
    Quote Originally Posted by Bjarne Stroustrup (2000-10-14)
    I get maybe two dozen requests for help with some sort of programming or design problem every day. Most have more sense than to send me hundreds of lines of code. If they do, I ask them to find the smallest example that exhibits the problem and send me that. Mostly, they then find the error themselves. "Finding the smallest program that demonstrates the error" is a powerful debugging tool.
    Look up a C++ Reference and learn How To Ask Questions The Smart Way

  3. #3
    Registered User awsdert's Avatar
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    Quote Originally Posted by laserlight View Post
    Would you count the use of \ to extend a #define macro across multiple lines?
    Nah, I count that as a single 'line' I mean examples like this from make:
    Code:
    build: $(objects)
      $(cc) -o $(out) $(objects)
    Where the syntax expects at least one extra line to be correct (I'm aware that particular example could take one line but I could not think of a better example off the top of my head)

  4. #4
    C++ Witch laserlight's Avatar
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    Then no, by definition all preprocessing directives are contained within a single logical line.
    Quote Originally Posted by Bjarne Stroustrup (2000-10-14)
    I get maybe two dozen requests for help with some sort of programming or design problem every day. Most have more sense than to send me hundreds of lines of code. If they do, I ask them to find the smallest example that exhibits the problem and send me that. Mostly, they then find the error themselves. "Finding the smallest program that demonstrates the error" is a powerful debugging tool.
    Look up a C++ Reference and learn How To Ask Questions The Smart Way

  5. #5
    Registered User awsdert's Avatar
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    Oh good, then I can make my code simpler then

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