Is there a character sequence recognized as a newline that's defined by the C standard and/or recognized by GCC? How can newlines be simulated after preprocessor directives to have them and C code share the same line? How about using digraphs or trigraphs?
#include <stdlib.h> [NEWLINE] int main() { exit(EXIT_SUCCESS); }
http://en.wikipedia.org/wiki/C_preprocessor#Multiple_lines says that they end at the first line which does not end in a backslash. How can we have them end within a line?
Unfortunately, this is not possible with macros.
You could, however, create a .h file to have the same effect; eg, have a myheader.h:
#include <stdlib.h>
int main() { exit(EXIT_SUCCESS); }
And then in your other files:
#include "myheader.h"
This is not possible, at least not on GCC. From the GCC documentation:
Except for expansion of predefined macros, all these operations are triggered with preprocessing directives. Preprocessing directives are lines in your program that start with `#'.
So the preprocessor must read an end-of-line after the include directive for this to work:
Different systems use different conventions to indicate the end of a line. GCC accepts the ASCII control sequences LF, CR LF and CR as end-of-line markers.
So you cannot use a newline sequence from a different platform, at least not on GCC.
There is no digraph for the newline:
Digraph: <% %> <: :> %: %:%: Punctuator: { } [ ] # ##
Nor is there a trigraph:
Trigraph: ??( ??) ??< ??> ??= ??/ ??' ??! ??- Replacement: [ ] { } # \ ^ | ~
Depending what you are trying to accomplish, the #line directive might do the trick.
#include <stdlib.h>
#line 1
int main() { exit(EXIT_SUCCESS); } /* this is on line 1 */
or more generally
#line __LINE__ - 1
Depending whom you are trying to fool, a vertical-tab character (control-K) might do the trick.
Or, it might not. I looked again at the standard and apparently vertical tabs don't count as newlines.
And a comp.std.c++ post today tells me that vertical tab in a preprocessing line is simply illegal (§16/2).