![]() ![]() I have a program that creates fonts that are included as code inside C programs and most values are wrapped around macros that split 32 bit values into 4 bytes, float into 4 bytes, etc. C:UsersJonathanDocumentsArduinolibrariesMFRC522srcMFRC522.cpp:1283:31: note: in expansion of macro F case STATUSERROR: return F(Error in. ![]() The ( įloat res = SUM_A(x,y) // note on the end I assume you are using clang : when clang detects an error or a warning in code expanded from a macro, it outputs one line for each macro whose expansion.As a simple example, in the C programming language, this is a typical macro that is not a parameterized macro, i.e., a parameterless macro: define PI 3. The use of macro name with set of actual parameters is replaced by some. A macro consists of name, set of formal parameters and body of code. To make an assembly program more readable.Macros are useful for the following purposes: This gives the macro some of the power of a function. A macro name is an abbreviation, which stands for some related lines of code. to tell the compiler "this macro continues on the next line") A parameterized macro is a macro that is able to insert given objects into its expansion. The \ at the end of each line is to signal line continuation (i.e.Typecasting to float necessary, since int/int = int in Cīrief explanation of the things in this macro: Thanks Daniel, I think you are right: my desired syntax isnt possible using a macro to wrap the complexity, but I think it is possible if I used a small function instead. Object-likemacros resemble data objects when used, function-likemacros resemble function calls. Whenever the name is used, it is replaced by the contents of the macro. ![]() I've found that this works on gcc and clang by default: #define SUM_A(x, y) \Īnswer = ((float)((x)*(x)) / ((x)+(y))) * (y) \ Macros A macrois a fragment of code which has been given a name. Since #defines are essentially just fancy text find-and-replace, you have to be really careful about how they're expanded. but it is somewhat possible with statement expressions (GNU extension). As far as I know, what you're trying to do (use if statement and then return a value from a macro) isn't possible in ISO C. ![]()
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