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 hold of the …
What is the purpose of the #define directive in C++?
2010年5月10日 · 0 in C or C++ #define allows you to create preprocessor Macros. In the normal C or C++ build process the first thing that happens is that the PreProcessor runs, the preprocessor looks …
How can I use #if inside #define in the C preprocessor?
How can I use #if inside #define in the C preprocessor? Asked 15 years, 8 months ago Modified 9 months ago Viewed 51k times
c++ - Why use #define instead of a variable - Stack Overflow
2011年5月14日 · What is the point of #define in C++? I've only seen examples where it's used in place of a "magic number" but I don't see the point in just giving that value to a variable instead.
c - "static const" vs "#define" vs "enum" - Stack Overflow
2009年11月4日 · Which one is better to use among the below statements in C? static const int var = 5; or #define var 5 or enum { var = 5 };
How can I define a define in C? - Stack Overflow
The question is if users can define new macros in a macro, not if they can use macros in macros.
What's the difference in practice between inline and #define?
2010年8月24日 · 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 to ignore it. …
c - #Define VS Variable - Stack Overflow
2012年6月18日 · #define WIDTH 10 is a preprocessor directive that allows you to specify a name (WIDTH) and its replacement text (10). The preprocessor parses the source file and each occurrence …
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 extension). Since …
c++ - 'static const' vs. '#define' - Stack Overflow
2009年10月28日 · Is it better to use static const variables than #define preprocessor? Or does it maybe depend on the context? What are advantages/disadvantages for each method?