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  1. c++ - Why use #define instead of a variable - Stack Overflow

    May 14, 2011 · Most compilers will allow you to define a macro from the command line (e.g. g++ -DDEBUG something.cpp), but you can also just put a define in your code like so: #define …

  2. Is it possible to use a if statement inside #define?

    As far as I know, what you're trying to do (use if statement and then return a value from a macro) isn't possible in ISO C... but it is somewhat possible with statement expressions (GNU …

  3. c++ - What does ## in a #define mean? - Stack Overflow

    In other words, when the compiler starts building your code, no #define statements or anything like that is left. A good way to understand what the preprocessor does to your code is to get …

  4. What's the difference in practice between inline and #define?

    Aug 24, 2010 · Macros (created with #define) are always replaced as written, and can have double-evaluation problems. inline on the other hand, is purely advisory - the compiler is free …

  5. c++ - 'static const' vs. '#define' - Stack Overflow

    Oct 28, 2009 · #define is a compiler pre processor directive and should be used as such, for conditional compilation etc.. E.g. where low level code needs to define some possible …

  6. Why do most C developers use define instead of const?

    Mar 4, 2017 · #define simply substitutes a name with its value. Furthermore, a #define'd constant may be used in the preprocessor: you can use it with #ifdef to do conditional compilation …

  7. What is the purpose of the #define directive in C++?

    Nov 27, 2015 · In the normal C or C++ build process the first thing that happens is that the PreProcessor runs, the preprocessor looks though the source files for preprocessor directives …

  8. c# - How do you use #define? - Stack Overflow

    Aug 19, 2008 · #define is used to define compile-time constants that you can use with #if to include or exclude bits of code. #define USEFOREACH #if USEFOREACH foreach(var item in …

  9. What is the difference between #define and const? [duplicate]

    DEFINE is a preprocessor instruction (for example, #define x 5). The compiler takes this value and inserts it wherever you are calling x in the program and generate the object file. "Define" …

  10. Is there a way to do a #define inside of another #define?

    Apr 16, 2015 · That file can then #ifdef _PASS2/#else to define macros for all the variables that should be different on the two passes. Even though the code gets generated twice, on some …

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