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Preprocessor question: defined value substitution [message #482346]

Wed, 26 August 2009 10:31

David Lucena

Messages: 74
Registered: August 2009

Member

Hi. I'm am trying to do something that I supposed that the preprocessor would do, but I am not sure if this behaviour is implemented.

I know the code would seem dumb, but is just for making the post short.

//#define ROWS = 10

int Rows = ROWS

It gives me errors because ROWS is not defined.

Regards.

David Lucena.

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Re: Preprocessor question: defined value substitution [message #482353 is a reply to message #482346]

Wed, 26 August 2009 10:56

David Lucena

Messages: 74
Registered: August 2009

Member

Looking at the antenna preprocessor source code I have found something and I've tested it. Its something limited, but works.

You will define your symbol somewhere

//#define ROWS = 10

And to recover its value and assing it:

int Rows;
//#expand Rows = %ROWS%;

That has its limitations, as you cannot do things like:

CreateRows( #expand %ROWS% );

But instead you have to do:

int Rows;
//#expand Rows = %ROWS%;
CreateRows( #expand %ROWS% );

Anyone has gone deep in the preprocessor? Maybe I'll try the antenna documentation, now that I remember.

Edited: I should had take a look to the antenna documentation. It is just I forget that preprocessor is the antenna, not the MTJ... Sorry.

[Updated on: Wed, 26 August 2009 10:58]

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Re: Preprocessor question: defined value substitution [message #482390 is a reply to message #482353]

Wed, 26 August 2009 12:31

Diego Madruga Sandin

Messages: 116
Registered: July 2009

Senior Member

Quote:

The preprocessor supports the following directives inside a Java source file. All directives follow a "//" comment that starts at the beginning of a line (whitespace is allowed left of them, but no Java code). That way, they don't interfere with normal Java compilation. Directives must not span multiple lines of code. In addition, whitespace is allowed between the // and the # of the directive to maintain preprocessor commands validity after eclipse source formatting.

From antenna proprocessor documentation

I believe the correct to declare what you want is: