<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 12 (filtered medium)"><style><!--
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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Hi,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>How can I get SWIG to generate a java class that “implements Comparable”?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Let’s say I have a C++ class X and an SWIG interface X that generates a compareTo(X rhs) method.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>If I use the Java class generated by SWIG in a TreeMap then the second put will throw this exception:<o:p></o:p></p><p class=MsoNormal>CREATION exception: java.lang.ClassCastException: com.myCompany.project.X<o:p></o:p></p><p class=MsoNormal>in exception handler got exception: java.lang.NullPointerException<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>But if I modify the generated X.java file from<o:p></o:p></p><p class=MsoNormal> public class X {<br>to <o:p></o:p></p><p class=MsoNormal> public class X implements Comparable<X> {<o:p></o:p></p><p class=MsoNormal>then the exception is not thrown and the compareTo function is used as expected.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Can I get SWIG to add “implements Comparable<X> to the class?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>FYI: For example of the test code:<o:p></o:p></p><p class=MsoNormal>X first = new X(1);<o:p></o:p></p><p class=MsoNormal>X last = new X(9);<o:p></o:p></p><p class=MsoNormal>TreeMap<X, String>mm = new TreeMap<X, String>();<o:p></o:p></p><p class=MsoNormal>String old = mm.put(last, "last");<o:p></o:p></p><p class=MsoNormal>// this next line throws the exeption<o:p></o:p></p><p class=MsoNormal>old = mm.put(first, “first”);<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Thanks,<o:p></o:p></p><p class=MsoNormal> Scott<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>