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- 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
- Explicitly Define Datatype in Python Function - Stack Overflow
Explicitly Define Datatype in Python Function Asked 8 years, 3 months ago Modified 2 years, 1 month ago Viewed 102k times
- Define a preprocessor macro through CMake - Stack Overflow
How do I define a preprocessor variable through CMake? The equivalent code would be #define foo
- How do I show the value of a #define at compile-time?
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 #define XSTR(x) STR(x) #define STR(x) #x The value of a macro can then be displayed with: #pragma message "The value of ABC: " XSTR(ABC) See: 3 4 Stringification in the gcc online
- Why use #define instead of a variable - Stack Overflow
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
- 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 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 Oh
- c++ - Declaring a function using #define - Stack Overflow
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 parameter behaviour
- c# - How do you use #define? - Stack Overflow
The main use-case for #define is for conditional compilation (where it can be very useful) You're correct that using #define for symbols and (please don't do it) macros, is not a good use-case
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