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What is the point of #define in c++ I want to write reusable code and need to declare some variables at the beginning and reuse them in the script, such as 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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The #define directive is a preprocessor directive I feel like constexpr is just a #define where the type can be chosen. 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 #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. $[ 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.
#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. 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) I've found that this works on gcc and clang by default:
I have been seeing code like this usually in the start of header files #ifndef headerfile_h #define headerfile_h and at the end of the file is #endif what is the purpose of this? 23 so i read the interesting answers about what are the differences between constexpr and const but i was curious about are the differences between #define and constexpr
