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How to check (via the preprocessor) if a C source file is being compiled as C++ code

The question title should say it all, but here's an example of what sort of thing I'm looking for:

#ifndef THE_IDENTIFIER_THAT_WOULD_INDICATE_BEING_COMPILED_AS_CPLUSPLUS

/*
 * Example of something that would matter.
 */
typedef enum _bool bool;
enum _bool { false, true };

#endif

What is the identifier? It's bugging me severely, as I know I've seen code that does this before.

I'm using GCC, by the way.

(I'm surprised I couldn't find a duplicate somewhere on SO. If someone else can find one, feel free to redirect me and close this as a dupe.)

like image 765
William Avatar asked Nov 10 '10 21:11

William


1 Answers

#ifndef __cplusplus

If I remember correctly.

like image 169
frast Avatar answered Sep 21 '22 18:09

frast