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.

Just do something like this: #ifdef USE_CONST #define MYCONST const #else #define MYCONST #endif Then you can write code like this: MYCONST int x = 1; MYCONST char* …

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 …

2017年3月4日 · #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 …

I'm working with the HCS12 MCU, and this was part of the library. I'm just wondering what the 1U, 2U, 4U, 8U... means in this code. I'm still learning how to use classes, please try to explain thi...

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?

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 …

I know that this is a long time after the original query, but this may still be useful. This can be done in GCC using the stringify operator "#", but it requires two additional stages to be defined first. …

2021年2月12日 · 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 …

2021年8月4日 · Mapped volumes can either be files/directories on the host machine (sometimes called bind mounts in the documentation) or they can be docker volumes that can be managed …