SWIG

wiesel wrote:
> I have a lot of variable declared as const. By default they are wrapped as
> read-only variables.
> 
> Is there an easy way to wrap them like "Constants"?
> 
> 
> e.g.
> 
> Input:
> __________________________________
> 
> const UNUM32 PC_TIMING = 7
> __________________________________
> 
> 
> Output:
> __________________________________
> 
> public static long getPC_TIMING() {
>   return EtasAllJNI.PC_TIMING_get();
> }
> __________________________________
> 
> my preferred output;
> __________________________________
> 
> public static final PC_TIMING = 7;
> __________________________________
> 
> 
> with best regards 
> 

Yes, this is possible. Read the documentation in Java.html and look for
%javaconst.

William

Yes, this is possible. Read the documentation in Java.html and look for
%javaconst.

William

-------------------------------------------------------------------------


Thank you for your advice. 

I have read the chapter and I use the "%javaconst(1);" directive. But the
Problem still exists. The 
reason might be the explanation of my problem. So I try ones more:


My simple test example:


Header File: example.h

#ifdef SWIG
  %constant const int TEST_01 = 1;
  %constant const int TEST_02 = 2;
#endif

#ifndef SWIG
  const int TEST_01 = 1;
  const int TEST_02 = 2;
#endif

__________________________________

SWIG File: example.i

%module example

%javaconst(1);

%{
  #include "example.h"
%}

%include "example.h";

__________________________________

Java File: example.java, exampleConstants .java

public class example implements exampleConstants {
}

public interface exampleConstants {
  public final static int TEST_01 = 1;
  public final static int TEST_02 = 2;
}

_____________________________________


How can I create a result like that, without redefinig all const variables?

Because without the %constant the variables are generated as read only
variable with access by getter methods.


with best regards 
-- 
View this message in context: http://www.nabble.com/Constants-tf3053092.html#a8647494
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wiesel wrote:
> 
> 
> Yes, this is possible. Read the documentation in Java.html and look for
> %javaconst.
> 
> William
> 
> -------------------------------------------------------------------------
> 
> 
> Thank you for your advice. 
> 
> I have read the chapter and I use the "%javaconst(1);" directive. But the
> Problem still exists. The 
> reason might be the explanation of my problem. So I try ones more:
> 
> 
> My simple test example:
> 
> 
> Header File: example.h
> 
> #ifdef SWIG
>   %constant const int TEST_01 = 1;
>   %constant const int TEST_02 = 2;
> #endif
> 
> #ifndef SWIG
>   const int TEST_01 = 1;
>   const int TEST_02 = 2;
> #endif
> 
> __________________________________
> 
> SWIG File: example.i
> 
> %module example
> 
> %javaconst(1);
> 
> %{
>   #include "example.h"
> %}
> 
> %include "example.h";
> 
> __________________________________
> 
> Java File: example.java, exampleConstants .java
> 
> public class example implements exampleConstants {
> }
> 
> public interface exampleConstants {
>   public final static int TEST_01 = 1;
>   public final static int TEST_02 = 2;
> }
> 
> _____________________________________
> 
> 
> How can I create a result like that, without redefinig all const variables?
> 
> Because without the %constant the variables are generated as read only
> variable with access by getter methods.
> 
> 
> with best regards 

>From the end of the constants section in Java.html:
"Note: declarations declared as const are wrapped as read-only variables
and will be accessed using a getter as described in the previous
section. They are not wrapped as constants."

Note that C++ compilers assign memory to const int values, so it isn't a
true constant, eg you can cast away the const and reassign it. I think
this is why SWIG does not treat it as such. Note that you can get true
compile time constants using static const integral values defined within
a class. If you want a compile time Java const, your other options are
to change your C++ to either an unnamed enum or a #define.

William