When release_GIL_and_enable_signal is switched on, the result object is created inside a nested try block (line 547 of wrap.cxx). Later, it is assumed to be visible in the enclosing scope of that try (line 563).
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try { |
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${overload._get_calling_pattern1()} |
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%if overload.release_GIL_and_enable_signal : |
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PyOS_sighandler_t sig = PyOS_getsig(SIGINT); |
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cpp2py::signal_handler::start(); // start the C++ signal handler |
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Py_BEGIN_ALLOW_THREADS; |
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try { |
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%endif |
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${overload._get_calling_pattern()}; // the call is here. It sets up "result" : sets up in the python layer. |
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%if overload.release_GIL_and_enable_signal : |
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} |
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catch(...) { |
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// an error has occurred : clean GIL, handler and rethrow |
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Py_BLOCK_THREADS; // cf python include, ceval.h, line 72 comments and below. |
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cpp2py::signal_handler::stop(); // stop the C++ signal handler |
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PyOS_setsig(SIGINT, sig); |
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throw; // |
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} |
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Py_END_ALLOW_THREADS; |
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cpp2py::signal_handler::stop(); |
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PyOS_setsig(SIGINT, sig); |
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%endif |
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%if not overload.is_constructor : |
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%if overload.rtype != "void" : |
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py_result = convert_to_python(std::move(result)); |
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%else: |
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Py_INCREF(Py_None); |
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py_result = Py_None; |
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%endif |
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%endif |
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return ${'py_result' if not py_meth.is_constructor else '0'}; |
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} |
I wanted to prepare a minimal example based on an existing wrapping unit test, but those seem to have been disabled in both TRIQS unstable and cpp2py.