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List:       pykde
Subject:    Re: AW: SIP translate Union
From:       Phil Thompson <phil () riverbankcomputing ! com>
Date:       2020-11-27 10:52:23
Message-ID: 065923f1b0ac1e6db39cf5f15ad546cb () riverbankcomputing ! com
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On 26/11/2020 08:08, Marian Thomsen wrote:
> Thank you for the advice!
> 
> Unfortunately I cant get a simple example to work.
> I have a simple union in the header test_union.h
> 
> 
> union {
>     int test1;
>     int test2;
> } u;
> 
> And this is the best I got so far in the .sip file:
> 
> 
> struct union{
> 
> %TypeHeaderCode
> #include <test_union.h>
> %End
> 
>     int *test1 {
>     %GetCode
>         sipPy = PyLong_FromLongLong(sipCpp->test1)
>         if(sipPy == NULL)
>             sipPy = NULL;
>     %End
>     %SetCode
>         if (PyLong_Check(sipPy))
>             sipCpp->test1;
>         else
>             sipErr = 1;
>     %End
>     };
>     int *test2 {
>     %GetCode
>         sipPy = PyLong_FromLongLong(sipCpp->test2);
>         if(sipPy == NULL)
>             sipPy = NULL;
>     %End
>     %SetCode
>         if (PyLong_Check(sipPy))
>             sipCpp->test2;
>         else
>             sipErr = 1;
>     %End
>     };
> }u;
> 
> I get a syntax error in the last line and have tried to write it so
> that sip would understand it, but also with something like:
> 
> 
> typedef struct union union;
> union u{ ... };
> 
> I got no luck so far. Am I completly wrong?
> 
> Some advice would be appreciated

First of all, the contents of your test_union.h file is the definition 
of a variable, not a type. It should be...

union u {
     int test1;
     int test2;
};

At the moment you can't wrap a union directly. You have to wrap it in a 
struct and pretend to Python that the struct is the union. Also there is 
a bug in the C code generator which generates invalid code (but the 
equivalent C++ code is Ok). So try something like the following...

struct u_wrapper /PyName=u/
{
%TypeHeaderCode
#include<test_union.h>

struct u_wrapper
{
     union u wrapped;
};
%End

     int test1 {
     %GetCode
         sipPy = PyLong_FromLongLong(sipCpp->wrapped.test1);
     %End
     %SetCode
         if (PyLong_Check(sipPy))
             sipCpp->wrapped.test1;
         else
             sipErr = 1;
     %End
     };
};

Phil
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