#1320 Java: typedef struct b b;

[xypron]

Dear maintainer,

I use Swig 2.0.9 for creating a Java wrapper for the following C include:

typedef struct _a a;

struct _a {
  a* foo;
};

typedef struct b b;

struct b {
  b* foo;
};

My expecation is that both generated classes are structurally equivalent. This is not the case.

Class _a uses
  public void setFoo(_a value) {
    testJNI._a_foo_set(swigCPtr, this, _a.getCPtr(value), value);
  }

which allows to easily access foo.

Unfortunately class b uses

  public void setFoo(SWIGTYPE_p_b value) {
    testJNI.b_foo_set(swigCPtr, SWIGTYPE_p_b.getCPtr(value));
  }

I would have expected

  public void setFoo(b value) {
    testJNI.b_foo_set(swigCPtr, this, b.getCPtr(value), value);
  }

Best regards

Xypron

[xypron]

Essentially

%define %glp_structure(TYPE)
%typemap(jni) TYPE * "jlong"
%typemap(jtype) TYPE * "long"
%typemap(jstype) TYPE * "TYPE"
%typemap(in) TYPE %{ $1 = ($&1_ltype)&$input; %}
%typemap(out) TYPE
%{ *($&1_ltype)&$result = $1; %}
%typemap(javain) TYPE * "TYPE.getCPtr($javainput)"
%typemap(javaout) TYPE * {
long cPtr = $jnicall;
return (cPtr == 0) ? null : new TYPE(cPtr, $owner);
}
%enddef
%glp_structure(b)
%include "my_include.h"

will produce the result wanted for this single case. But I do not see why this should be necessary.

I suggest a logic like the one above should be merged into the standard behavior of Swig.

Best regards

Xypron

[Olly Betts]

With git master I get:

  public void setFoo(b value) {   
    xJNI.b_foo_set(swigCPtr, this, b.getCPtr(value), value);
  }

That appears to be the code you wanted so it seems this has been fixed in the meantime, so closing. If you're still seeing the problem, please open a new ticket on https://github.com/swig/swig with a reproducer.