Re: SWIG syntax error on list initializer of template ctor parameter

On Wed, 30 Sep 2020 at 18:15, <[email protected]> wrote:

> > You can work around it by declaring your variable using this syntax
> instead:
> >
> >   const A<char, 3> A3 = A(std::array<char, 3>{'A','B','C'});
>
> Trying that gets me:
>
> ```
> AJAVA_wrap.cxx: In function 'jlong Java_exampleJNI_A3_1get(JNIEnv*,
> jclass)':
> AJAVA_wrap.cxx:242:15: error: no matching function for call to 'A<char,
> 3>::A()'
>    A< char,3 > result;
>                ^~~~~~
> ```
>
> AJAVA_wrap.cxx lines 240-249:
>
> ```
> SWIGEXPORT jlong JNICALL Java_exampleJNI_A3_1get(JNIEnv *jenv, jclass
> jcls) {
>   jlong jresult = 0;
>   A< char,3 > result;
>
>   (void)jenv;
>   (void)jcls;
>   result = (A< char,3 >)A3;
>   *(A< char,3 > **)&jresult = new A< char,3 >((const A<char, 3> &)result);
>   return jresult;
> }
> ```
>

SWIG needs to parse the definition of A otherwise it doesn't know there is
no default constructor, so change A.i to:

%{
#include "A.h"
%}

%include "A.h"

and make the suggested change for A3. Then the generated code is:

SWIGEXPORT jlong JNICALL Java_exampleJNI_A3_1get(JNIEnv *jenv, jclass jcls)
{
  jlong jresult = 0 ;
  A< char,3 > *result = 0 ;

  (void)jenv;
  (void)jcls;
  result = (A< char,3 > *)&A3;
  *(A< char,3 > **)&jresult = result;
  return jresult;
}

If using c++14 or earlier, you'll need the template parameters:

const A<char, 3> A3 = A<char, 3>(std::array<char, 3> {'A','B','Z'});


William

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