CODEWITHSUNDEEP
c++c-preprocessor
user2201041
user2201041

Reputation:

How to check if a function-like macro is defined?

I have a line in my code that looks like this: 

#ifndef MACRO(n)

This actually works fine on most compilers. However, this fails on Solaris, because the official syntax is # ifndef identifier new-line groupopt and parentheses are not allowed in identifiers.

What is the proper way to check whether this macro is defined?

Upvotes: 6

Views: 1901

Answers (1)

marcinj
marcinj

Reputation: 49986

You dont need (n), actually gcc will complain if you use it:

warning: extra tokens at end of #ifndef directive

this is because #ifndef expects an identifier not expression, (n) is probably ignored by preprocessor

It should suffice to simply check with macro definition name:

#ifndef MACRO

Upvotes: 8

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