Difference between `constexpr` and `#define` - Stack Overflow
Feb 12, 2021 · 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 …
What is the scope of a #define? - Stack Overflow
Jul 6, 2016 · What is the scope of a #define? I have a question regarding the scope of a #define for C/C++ and am trying to bet understand the preprocessor. Let's say I have a project …
c++ - Declaring a function using #define - Stack Overflow
Jul 9, 2018 · The #define version is still a macro. The code is expanded at the invocation site. It has all the expected problems (with macros) including namespace pollution and unexpected …
What is the difference between #define and const? [duplicate]
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 …
c++ - Why use #define instead of a variable - Stack Overflow
May 14, 2011 · 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 - #ifdef inside #define - Stack Overflow
I am trying to write something like this: #define COV_ON(x) \ #ifdef COVERAGE_TOOL \ _Pragma (COVERAGE #x) #endif Is there any way to define COV_ON like this? I know what I …
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 …
Array format for #define (C preprocessor) - Stack Overflow
Probably a naïve question - I used to program 20 years ago and haven't coded much since. My memory of how the C preprocessor works has atrophied significantly since then... I am writing …
c - #define or enum? - Stack Overflow
Jun 29, 2010 · Possible Duplicate: Why use enum when #define is just as efficient? When programming in C, is it better practice to use #define statements or enums for states in a state …
What does #define _POSIX_SOURCE mean? - Stack Overflow
Jan 19, 2018 · What advantages does using #define _POSIX_SOURCE in C confer to my program? Can I access more libraries in my program or I can call some functions which are …