Good Programming Practices for Macro Definitions (#define) in C
34. When doing a macro that is to run its argument and behave like an expression, this is idiomatic: #define DOIT(x) do { x } while(0) This form has the following advantages: It needs a terminating semicolon. It works with nesting and braces, e.g. with if/else. answered Nov 26, 2008 at 15:43. unwind. 399k 64 483 616.
macro definition containing #include directive - Stack Overflow
Nov 6, 2008 · Realise that preprocessor directives won't do anything inside a macro, however they WILL do something in a file. So, you can stick a block of code you want to mutate into a file, thinking of it like a macro definition (with pieces that can be altered by other macros), and then #include this pseudo-macro file in various places (make sure it has ...
Define a preprocessor macro through CMake - Stack Overflow
Jan 26, 2012 · 1.) target_compile_definitions. If you are using CMake 3.X your first choice for adding a preprocessor macro should be target_compile_definitions. The reason you should prefer this approach over any other approach is because it granularity is target based. IE the macro will only be added to your exe/library.
Macroeconomics Overview - World Bank Group
Apr 1, 2024 · Macroeconomics is the branch of economics that deals with the overall functioning of the economy. Macroeconomic policies have a critical influence on the decisions of households and firms to spend, save, hire and invest. And the conditions they foster set the stage for economic growth and development. The World Bank Group’s macroeconomists work toward …
How can I define a C++ preprocessor macro through the …
ADD_DEFINITIONS(-DMACRO) ENDIF(DEFINE_MACRO) Then you can turn that option ON/OFF via the command line with CMake using the -D flag. Example: cmake -DDEFINE_MACRO=OFF .. To make sure the compiler is receiving the definition right, you can call make in verbose mode and check for the macro being defined or not: make VERBOSE=1.
c++ - Redefining or changing macro value - Stack Overflow
Mar 28, 2015 · Note that you won't be able to save the existing value and restore it, if you need to restore. The only way for you will be to redefine the macro with 13 which is obviously a hard coded value. As for the answers, you already have 2 below which are correct. – Alexis Wilke.
c - # and ## in macros - Stack Overflow
52. An occurrence of a parameter in a function-like macro, unless it is the operand of # or ##, is expanded before substituting it and rescanning the whole for further expansion. Because g 's parameter is the operand of #, the argument is not expanded but instead immediately stringified ("f(1,2)"). Because h 's parameter is not the operand of ...
c++ - How to prevent macro redefinition - Stack Overflow
Nov 23, 2018 · There is no such tool that automates it. You have to go read the code in those header files, figure out what is going on and take appropriate actions. The most you can do is. Check if macro is defined using ifdef or if defined(...) or if !defined(...) preprocessor constructs. Undefine macro using undef.
c++ - VS2017 #error: : Macro definition of snprintf conflicts with ...
Sep 5, 2018 · If you are using that definition anywhere in your code then you need to verify that the macro definition is compatible with the standard library function. If not then you need to rewrite the code as appropriate.
Macro redefinition in C and C++ - Stack Overflow
Nov 14, 2012 · Macro redefinition in C and C++. I know that this code is valid both in C and C++: ISO/IEC 14882:2011. 16.3 Macro replacement [cpp.replace] 2 An identifier currently defined as an object-like macro may be redefined by another #define preprocessing directive provided that the second definition is an object-like macro definition and the two ...