CODEWITHSUNDEEP
ceclipsec-preprocessor
yonzmeer
yonzmeer

Reputation: 362

Eclipse CDT- go to next line in #define statement

I'm working in Eclipse-CDT and I have the following #define statement:

#define IS_ARGUMENT_NULL(arg) if (NULL == arg) {fprintf(stderr, "%s is NULL", #arg); bool isNull = true;}

The line is too long for me (I need to keep up to max 80 characters per line) and I was wondering how could I go down a line with the code to compile ok. I tried pressing enter and getting

#define IS_ARGUMENT_NULL(arg) if (NULL == arg) {fprintf(stderr, "%s is NULL", #arg);
bool isNull = true;}

but it won't compile. Says "expected identifier or ‘(’ before ‘}’ token" on the second line

Upvotes: 0

Views: 246

Answers (1)

kaylum
kaylum

Reputation: 14044

Backslash (\) is the line continuation character.

#define IS_ARGUMENT_NULL(arg) \
    if (NULL == arg) { \
        fprintf(stderr, "%s is NULL", #arg); \
        bool isNull = true; \
    }

From the gcc manual:

The macro's body ends at the end of the ‘#define’ line. You may continue the definition onto multiple lines, if necessary, using backslash-newline. When the macro is expanded, however, it will all come out on one line.

Upvotes: 1

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