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It happened again.
I have many cases of modules with something like #ifdef TYPEA ... many lines #endif #ifdef TYPEB ... many similar lines #endif #ifdef TYPEC ... many similar lines #endif
It happens that I am looking at the type b code trying to figure out something in type a (the codes are VERY similar).
To avoid this, I have tried
blah,blah // comment TYPEA
and that "kind of works"
Now, the ideal would be if for type a I could do the following: #ifdef TYPEA #define ATYPE #define BTYPE // #define CTYPE // #endif
and then just make it ATYPE blah,blah // comment
Of course this does not work. Does anyone have a trick that makes this possible?
Erik
"This would be a lot easier by putting these segments into separate files, and then in the main file just writing ..."
And for #include, the preprocessing tokens after include in the directive are processed just as in normal text (i.e., subject to macro replacement), so one can locate all the names in the source file's front matter or separate header file, leaving the code in the function's body relatively clean and free of #if/#elif/#else/#endif if that's desireable.
#if defined(VARIANT_A) # define FRAGMENT_FOO1 "fragment_foo1_A.c" # define FRAGMENT_FOO2 "fragment_foo2_A.c" # define FRAGMENT_FOO3 "fragment_foo3_A.c" #elif defined(VARIANT_B) # define FRAGMENT_FOO1 "fragment_foo1_B.c" # define FRAGMENT_FOO2 "fragment_foo2_B.c" # define FRAGMENT_FOO3 "fragment_foo3_B.c" #elif defined(VARIANT_C) # define FRAGMENT_FOO1 "fragment_foo1_C.c" # define FRAGMENT_FOO2 "fragment_foo2_C.c" # define FRAGMENT_FOO3 "fragment_foo3_C.c" #endif void foo(void) { #include FRAGMENT_FOO1 /* * ... some code ... */ #include FRAGMENT_FOO2 /* * ... some more code ... */ #include FRAGMENT_FOO3 }