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From: Robert Klemme <shortcutter@googlemail.com>
Newsgroups: comp.lang.java.programmer
Subject: Re: preprocessor idea
Date: Thu, 13 Oct 2011 18:35:10 +0200
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On 12.10.2011 01:17, Arne Vajh=F8j wrote:
> On 10/11/2011 2:19 PM, Philipp Kraus wrote:
>> I use within my Java code different external libraries (DLL), so I hav=
e
>> create a string array with their names
>> so the libraries can be load with System.load / System.loadLibrary.
>>
>> I build the libraries (C++ code) with a toolchain and I use a lot of
>> preprocessor commands within
>> the C++ code, so I can enable or disable some function and so the usin=
g
>> of the libraries eg:
>>
>> c++:
>> #ifdef lib1
>> #endif
>>
>> #ifdef lib2
>> #endif
>>
>> So my Java code must load lib1 and lib2 if both defs are set. Java doe=
s
>> not support any preprocessor
>> flags, but in this case I need a tip for creating a flexiable Java cod=
e
>> during the class is compiled
>> (eg: ifdef1 =3D true =3D> String[] javaarray =3D {"lib1"}). Do you kno=
w any
>> idea for this problem?
>
> Run the Java code through the C preprocessor with the same defines.
>
> String[] javaarray =3D {
> "None"
> #ifdef lib1
> ,"lib1"
> #endif
> #ifdef lib1
> ,"lib1"
> #endif
> };

I do not think it's worthwhile to open that can of worms for this=20
decision.  After all getting rid of the CPP is one of the major=20
advantages of Java over C++ (even Stroustrup regrets not having ripped=20
it out of C++) and complicating the Java build process just for that=20
decision seems too heavy - especially since there are other solutions=20
available.

Kind regards

	robert

--=20
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/