Merge commit '4ebe6417a5fce5f0994fc0c31bebf732be96a07c' as 'boost'

boost/libs/python/src/errors.cpp

@@ -0,0 +1,105 @@
+// Copyright David Abrahams 2001.
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_PYTHON_SOURCE
+# define BOOST_PYTHON_SOURCE
+#endif
+
+#include <boost/python/errors.hpp>
+#include <boost/cast.hpp>
+#include <boost/python/detail/exception_handler.hpp>
+
+namespace boost { namespace python {
+
+error_already_set::~error_already_set() {}
+
+// IMPORTANT: this function may only be called from within a catch block!
+BOOST_PYTHON_DECL bool handle_exception_impl(function0<void> f)
+{
+    try
+    {
+        if (detail::exception_handler::chain)
+            return detail::exception_handler::chain->handle(f);
+        f();
+        return false;
+    }
+    catch(const boost::python::error_already_set&)
+    {
+        // The python error reporting has already been handled.
+    }
+    catch(const std::bad_alloc&)
+    {
+        PyErr_NoMemory();
+    }
+    catch(const bad_numeric_cast& x)
+    {
+        PyErr_SetString(PyExc_OverflowError, x.what());
+    }
+    catch(const std::out_of_range& x)
+    {
+        PyErr_SetString(PyExc_IndexError, x.what());
+    }
+    catch(const std::invalid_argument& x)
+    {
+        PyErr_SetString(PyExc_ValueError, x.what());
+    }
+    catch(const std::exception& x)
+    {
+        PyErr_SetString(PyExc_RuntimeError, x.what());
+    }
+    catch(...)
+    {
+        PyErr_SetString(PyExc_RuntimeError, "unidentifiable C++ exception");
+    }
+    return true;
+}
+
+void BOOST_PYTHON_DECL throw_error_already_set()
+{
+    throw error_already_set();
+}
+
+namespace detail {
+
+bool exception_handler::operator()(function0<void> const& f) const
+{
+    if (m_next)
+    {
+        return m_next->handle(f);
+    }
+    else
+    {
+        f();
+        return false;
+    }
+}
+
+exception_handler::exception_handler(handler_function const& impl)
+    : m_impl(impl)
+    , m_next(0)
+{
+    if (chain != 0)
+        tail->m_next = this;
+    else
+        chain = this;
+    tail = this;
+}
+
+exception_handler* exception_handler::chain;
+exception_handler* exception_handler::tail;
+
+BOOST_PYTHON_DECL void register_exception_handler(handler_function const& f)
+{
+    // the constructor links the new object into a handler chain, so
+    // this object isn't actaully leaked (until, of course, the
+    // interpreter exits).
+    new exception_handler(f);
+}
+
+} // namespace boost::python::detail
+
+}} // namespace boost::python
+
+