How do I propagate C++ exceptions to Python in a SWIG wrapper library?

Question

I\'m writing a SWIG wrapper around a custom C++ library which defines its own C++ exception types. The library\'s exception types are richer and more specific than standard

Answer 1

U can also use:

catches: http://www.swig.org/Doc3.0/SWIGPlus.html#SWIGPlus_catches

Example:

%catches(std::exception, std::string, int, ...);

which generates for each function a try catch block:

  try {
    result = (namespace::Function *)new namespace::Function ((uint16_t const *)arg1);
  }
  catch(std::exception &_e) {
    SWIG_exception_fail(SWIG_SystemError, (&_e)->what());
  }
  catch(std::string &_e) {
    SWIG_Python_Raise(SWIG_From_std_string(static_cast< std::string >(_e)), "std::string", 0); SWIG_fail;
  }
  catch(int &_e) {
    SWIG_Python_Raise(SWIG_From_int(static_cast< int >(_e)), "int", 0); SWIG_fail;
  }
  catch(...) {
    SWIG_exception_fail(SWIG_RuntimeError,"unknown exception");
  }