C++ # is not followed by a macro parameter

Author: ovfb

August undefined, 2024

WebAug 17, 2011 · This question describes a way to suppress the unused parameter warning by writing a macro inside the function code: Universally compiler independent way of implementing an UNUSED macro in C/C++ But I'm interested in a macro that can be used in the function signature: void callback (int UNUSED (some_useless_stuff)) {} WebSometimes (like the Visual C++), the debugging info is extracted into a separate file - but you would need that file and know its format, to extract that info. And you would be getting only the debug info. Not the compiled code. The parameters are the way to go.

c++ - Macro to Get function name and parameter values from within ...

WebMar 31, 2024 · How to redefine c++ macro with reduced parameters? Ask Question Asked 7 days ago Modified 5 days ago Viewed 54 times 0 I have following macros in an existing project, #define TRACE1 (attr,str,...) REL_LOG (attr, str, ##_VA_ARGS__) #define TRACE2 (str,...) REL_LOG (str, ##_VA_ARGS__) And they have been used like, WebMay 17, 2024 · By defining a macro named CHECK_DEBUG we can change the result if the macro was not defined, e.g.:. godbolt. #define TEST CAT(CHECK_,DEBUG), 0, 1 … rawlins wyoming hotels and motels

c++ - How to use #ifndef with macro argument? - Stack Overflow

WebApr 10, 2024 · Macros are expanded by the preprocessor during preprocessing. c. #ifdef, #ifndef, #if, #else, #elif, and #endif: These directives are used for conditional compilation. They allow the preprocessor to include or exclude sections of code based on whether a certain macro is defined or not, or based on the value of an expression. Include Guards WebJan 25, 2024 · No, this is not possible. During translation, all preprocessing directives ( #define, #include, etc.) are executed before any macro expansion occurs, so if a macro expands into a preprocessing directive, it won't be interpreted as such - it will be interpreted as (invalid) source code. Share Improve this answer Follow answered Jan 24, 2024 at … WebApr 13, 2024 · Then, we initialize each thread giving it the function to execute ** multiply_threading ** that has the following signature: ```c void multiply_threading(Matrix& result, const int thread_number, const Matrix& m1, const Matrix& m2); ``` The first parameter is the output matrix, The second parameter is the thread number (later on … rawlins wyoming mortuary

error # is not followed by a macro param - C++ Forum

Typechecking macro arguments in C - Stack Overflow

WebNov 8, 2024 · You cannot use preprocessor conditional directives inside a macro. Generally speaking, the solution is to turn that inside out: use conditional directives to define the … Web2 days ago · I want to call the show.py in my Qt project. The p_stdout should be hello, but I just get an empty string "", the exit code is 1, and the exit status is QProcess::NormalExit. This is my simple health habitsWebNov 6, 2024 · # # Compile as C++11, supported in ROS Kinetic and newer # add_compile_options(-std=c++11) # # Find catkin macros and libraries # # if COMPONENTS list like find_package(catkin REQUIRED COMPONENTS xyz) ... # # To declare and build dynamic reconfigure parameters within this # # package, follow these … rawlins wyoming newspaper

"WebNov 20, 2024 · You can fix this with an extra "helper" macro: #define MAX_NAME_LEN 15 #define STRINGIFY (s) \ #s #define PRINT_CELL (x) \ printf (" %" STRINGIFY … " - C++ # is not followed by a macro parameter

C++ # is not followed by a macro parameter

c++ - How to use #ifndef with macro argument? - Stack …

WebJan 17, 2024 · From standard - §6.10.1p5. Preprocessing directives of the forms. # ifdef identifier new-line groupopt # ifndef identifier new-line groupopt. check whether the … WebMar 2, 2016 · Since you added the C++ tag not using macros is a valid answer. If you just want to talk about the pre-processor just tag it as pre-processor and not C++ – Martin York Nov 22, 2010 at 23:20 15 @Martin: The preprocessor is as much a part of C++ as the STL is; should questions about the STL be tagged [stl] and not [c++] too?

Did you know?

WebJan 4, 2016 · Such macros are called by writing. macro_identifier () in the subsequent source code. The syntax is identical to that of a … WebMay 30, 2012 · do not enclose arguments of macro in parentheses in the macro body, so if those arguments are expressions, operators with different precedences in those …

WebSep 25, 2015 · It's a pity that the defined operator is available only in the context of #if and #ifelse, but not for macro expansions. As it stands, I agree with rici about the solutions … WebDec 12, 2013 · This won't work if I pass it a template that has more than one parameter, because the comma in the is interpreted as separating the macro arguments, …

WebAug 2, 2024 · Each formal parameter in token-string that is not preceded by a stringizing ( # ), charizing ( #@ ), or token-pasting ( ##) operator, or not followed by a ## operator, is … WebDec 12, 2024 · A macro is a piece of code in a program that is replaced by the value of the macro. Macro is defined by #define directive. Whenever a macro name is encountered by the compiler, it replaces the name with the definition of the macro. Macro definitions need not be terminated by a semi-colon (; ).

WebJun 22, 2011 · As JAB pointed, macros are different than functions, they do not require the type of arguments #define TRACERPTR (pReporter, eComponent, eLevel, sFormat, formatArgs...) \ if (pReporter != NULL) { pReporter->trace (eComponent, eLevel, sFormat, ##formatArgs); } Share Improve this answer Follow answered Jun 20, 2011 at 19:27 …

WebOct 29, 2024 · The #if(!(x)) needs to be a regular if, not a preprocessor if. And you need to make sure you have a backslash at the end of every line you want in the macro (except … simplehealthkit.comWebSep 9, 2012 · A common way to enforce macros end on a semicolon, and creating the same effect (i.e., creating a new local block), would be to use #define CHECK_TYPE (type,var) do { ... } while (0), which is probably preferable in almost all cases. – Ionic Mar 19, 2024 at 3:44 Add a comment 3 No, macros can't provide you any typechecking. simple health jobsWebJun 3, 2014 · The C preprocessor throws an error because the STATIC_ASSERT macro only takes one parameter. The two main solutions to this problem are to use double parentheses and, more recently, to use variadic macros: // Invoke the macro this way... rawlins wyoming police blotterWebMar 1, 2012 · You can use a variadic macro and then pass the string format and the function parameters to it. The macro won't be exactly the same for every function (as … rawlins wyoming places to stayWebApr 10, 2024 · I want to use macros or template metaprogramming to generate some code for me. So basically these enum values are 1 shifted by the index of enum I want to avoid any typos in case in future some adds a new enum value and I can simply define an array of string for the named enums and generate functions for it and return value based on the … simple health kitchen st paul\u0027sWebNov 19, 2024 · There are 2 problems with your macro definition: It uses incorrect syntax The name of a variable may be passed as a; in this case you cannot simply put the variable next to 2 string literals to do a concatenation. The latter problem can be solved by using a string and the + operator or simply using multiple printf s. simple health kitchen st paul\\u0027sWebMar 31, 2015 · 1 #ifndef DEF_H 2 #define DEF_H 3 #define DEBUG_MODE 4 #define DEBUG_INFO (message) \ 5 #ifdef DEBUG_MODE \ 6 cout << message << endl; \ 7 … simple health kitchen watling street