![]() ![]() ![]() And if arg is not zero, SOMEMACRO (arg) should expand to 'DEF'. Further I want SOMEMACRO (arg) to expand to 'ABC' if arg is 0. #define SPI_MOSI (digitalPinToPinName(PIN_SPI_MOSI))Ĭ:\Users\LABO\Documents\Arduino\libraries\LedControl\src/LedControl.h:75:13: note: in expansion of macro 'SPI_MOSI'Ĭ:\Users\LABO\Documents\Arduino\libraries\LedControl\src/LedControl. Conditional Preprocessor macro expansion in C. #define digitalPinToPinName(P) (g_APinDescription.name)Ĭ:\Users\LABO\AppData\Local\Arduino15\packages\arduino\hardware\mbed\1.1.2\variants\ARDUINO_NANO33BLE/pins_arduino.h:132:21: note: in expansion of macro 'digitalPinToPinName' Prefer inline or static functions to function-like macros and PRE02-C. Because it is important to know how to correctly apply the syntax in source code so that it can be reused again and again whenever it is needed. Parenthesize all parameter names in macro definitions. Now we will discuss how does a macro works in programming through C++ code. It might help to identify which compiler youre using does it recognize C99/C++ comments marked by // to end of line Also, Im fairly sure youve not minimized the code the PUT macro doesnt use any of the others, so you should be able to eliminate all but the last line of the code you show. Macro invocations appearing in that expansion are left unchanged. In first case, after expanding MACROCOMBINEINNER you get: ABCLINE which turns into ABCLINE, because LINE is not a separate token here. Some languages, such as C and C++, provide a way to define and invoke preprocessor. In file included from C:\Users\LABO\AppData\Local\Arduino15\packages\arduino\hardware\mbed\1.1.2\variants\ARDUINO_NANO33BLE/pins_arduino.h:4:0,įrom C:\Users\LABO\AppData\Local\Arduino15\packages\arduino\hardware\mbed\1.1.2\cores\arduino/Arduino.h:81,įrom C:\Users\LABO\AppData\Local\Temp\arduino_build_582431\sketch\:1:Ĭ:\Users\LABO\AppData\Local\Arduino15\packages\arduino\hardware\mbed\1.1.2\cores\arduino/macros.h:27:55: error: expected ')' before '.' token For example, if in the code it is written like define AREA (15,16) then the result will be 240. 1 Answer Sorted by: 2 Order of expansion plays role here, first the outlier macro is expanded, then inner ones. Now I've another problem, and I don't understand what it means. ![]() This is known as the expansion of macros. Macro Processor replaces each macro instruction with the corresponding group of source language statements. I'm trying to compile the demo matrix code from this lib. C preprocessor - Wikipedia Macro Expansion (The GNU C Preprocessor Internals) Error in expansion of macro malloc, realloc 5044 - Github Mapfre y Swiss. Macro represents a group of commonly used statements in the source programming language. ![]()
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