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18-May-2016 16:31

This page lists the reserved identifiers and discusses the pitfalls.

Hi all, I have got a problem where i have to execute a portion of code only when a header file is included somewhere in the source file. for example if included placebo.h If placebo.h is written well, it will have guards against multiple inclusion. defined(PLACEBO_H_GUARD) #define PLACEBO_H_GUARD /* the header contents go here */ #endif Look in the header and find the name of the guarding macro.

I have made this list of recipes, but for some reason I get a ton of error messages when I try to validate the documents in Oxygen XML Editor.

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I don't think of the name of the macro as part of the interface.Use it in your own code: #if defined(PLACEBO_H_GUARD) /* code to be used when placebo.h is included */ #else /* code to be used otherwise */ #endif If placebo.h is written well, it will have guards against multiple inclusion. defined(PLACEBO_H_GUARD) #define PLACEBO_H_GUARD /* the header contents go here */ #endif Look in the header and find the name of the guarding macro.Use it in your own code: #if defined(PLACEBO_H_GUARD) /* code to be used when placebo.h is included */ #else /* code to be used otherwise */ #endif Yes, that can work, but personally I'd hesitate to use a guarding macro outside the header that defines it.It's usually better to use something that *is* part of the interface.For example, provides "__bool_true_false_are_defined". If the header doesn't provide a testable macro, perhaps you can prevail on the author to add one (which should be easy if you're the author).

I don't think of the name of the macro as part of the interface.Use it in your own code: #if defined(PLACEBO_H_GUARD) /* code to be used when placebo.h is included */ #else /* code to be used otherwise */ #endif If placebo.h is written well, it will have guards against multiple inclusion. defined(PLACEBO_H_GUARD) #define PLACEBO_H_GUARD /* the header contents go here */ #endif Look in the header and find the name of the guarding macro.Use it in your own code: #if defined(PLACEBO_H_GUARD) /* code to be used when placebo.h is included */ #else /* code to be used otherwise */ #endif Yes, that can work, but personally I'd hesitate to use a guarding macro outside the header that defines it.It's usually better to use something that *is* part of the interface.For example, provides "__bool_true_false_are_defined". If the header doesn't provide a testable macro, perhaps you can prevail on the author to add one (which should be easy if you're the author).For example: #ifndef _BACKWARD_ALLOC_H #define _BACKWARD_ALLOC_H 1 Others are like this.