A good way to understand what the preprocessor does to your code is to get hold of the preprocessed output and look at it. 0 in c or c++ #define allows you to create preprocessor macros What is the point of #define in c++
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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.
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Upvoting indicates when questions and answers are useful What's reputation and how do i get it Instead, you can save this post to reference later. The #define directive is a preprocessor directive
The preprocessor replaces those macros by their body before the compiler even sees it Think of it as an automatic search and replace of your source code A const variable declaration declares an actual variable in the language, which you can use.well, like a real variable Take its address, pass it around, use it, cast/convert it, etc
How do i define a function with optional arguments
Asked 13 years, 7 months ago modified 1 year, 3 months ago viewed 1.2m times Our solution was to use an environment variable with /d defines in it, combined with the additional options box in visual studio In visual studio, add an environment variable macro, $(externalcompileroptions), to the additional options under project options → c/c++ → command line (remember both debug and release configurations) set the environment variable prior to calling msbuild #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 based on its value, or use the stringizing operator # to get a string with its value. 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?
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