Define Optimize Synonym

In recent times, define optimize synonym has become increasingly relevant in various contexts. 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 #define s are essentially just fancy text find-and-replace, you have to be really careful about how they're expanded. I've found that this works on gcc and clang by default: What is the difference between #define and const? 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. Building on this, c - #Define VS Variable - Stack Overflow.

#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 of the name is replaced by its associated text. The compiler never actually sees a macro name at all, what it sees is the replaced text.

How to pass a variable into a YAML template parameter and use it in a .... value: $(<variable-name>) # equivalent to: value: $[ variables[“variable_name”] ] # or value: $[ variables.variable_name ] As a macro is a shorthand for a runtime expression, they can’t be embedded inside another runtime expression. If you are passing a variable into a template parameter with the intention of using it as part of another runtime expression, the easiest method is to copy ...

What is the purpose of the #define directive in C++?. 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 though the source files for preprocessor directives like #define or #include and then performs simple operations with them. Why do most C developers use define instead of const?. Similarly, #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. c - "static const" vs "#define" vs "enum" - Stack Overflow. 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 }; c++ - 'static const' vs. '#define' - Stack Overflow. Is it better to use static const variables than #define preprocessor?

Or does it maybe depend on the context?