[Haskell-cafe] C++ exception (from *.so) catchable by Haskell??

Peter Simons simons at cryp.to
Thu Feb 13 23:38:02 UTC 2014

Hi Nick,

please note that the handler set by std::unexpected() fires only if a
function violates its exception specification, i.e. the function

  void foobar() throw() { throw 0; }

would trigger std::unexpected_handler(), but

  void foobar() { throw 0; }

does not, because there is no "unexpected" exception. Uncaught exceptions,
on the other hand, trigger the function std::terminate(), which by default
translates to std::abort().

Brandon Allbery pointed this out before, but it's probably worth
repeating: there is no way to catch (or throw) a C++ exception in Haskell.
The internal details of C++ exception handling are "implementation
defined". There is no standard that defines how to implement exceptions,
which means that you cannot even mix code from different C++ compilers if
you want to handle exceptions. Mixing in Haskell code is probably next to

Take care,

More information about the Haskell-Cafe mailing list