Add exception translation for std::overflow_error. (pybind#1977)

Author: bluescarni

docs/advanced/exceptions.rst

@@ -28,6 +28,8 @@ exceptions:
 +--------------------------------------+--------------------------------------+
 | :class:`std::range_error`            | ``ValueError``                       |
 +--------------------------------------+--------------------------------------+
+| :class:`std::overflow_error`         | ``OverflowError``                    |
++--------------------------------------+--------------------------------------+
 | :class:`pybind11::stop_iteration`    | ``StopIteration`` (used to implement |
 |                                      | custom iterators)                    |
 +--------------------------------------+--------------------------------------+

include/pybind11/detail/internals.h

@@ -211,6 +211,7 @@ inline void translate_exception(std::exception_ptr p) {
     } catch (const std::length_error &e)     { PyErr_SetString(PyExc_ValueError,    e.what()); return;
     } catch (const std::out_of_range &e)     { PyErr_SetString(PyExc_IndexError,    e.what()); return;
     } catch (const std::range_error &e)      { PyErr_SetString(PyExc_ValueError,    e.what()); return;
+    } catch (const std::overflow_error &e)   { PyErr_SetString(PyExc_OverflowError, e.what()); return;
     } catch (const std::exception &e)        { PyErr_SetString(PyExc_RuntimeError,  e.what()); return;
     } catch (...) {
         PyErr_SetString(PyExc_RuntimeError, "Caught an unknown exception!");

tests/test_exceptions.cpp

@@ -116,6 +116,7 @@ TEST_SUBMODULE(exceptions, m) {
     m.def("throws5", []() { throw MyException5("this is a helper-defined translated exception"); });
     m.def("throws5_1", []() { throw MyException5_1("MyException5 subclass"); });
     m.def("throws_logic_error", []() { throw std::logic_error("this error should fall through to the standard handler"); });
+    m.def("throws_overflow_error", []() {throw std::overflow_error(""); });
     m.def("exception_matches", []() {
         py::dict foo;
         try {

tests/test_exceptions.py

@@ -79,6 +79,10 @@ def test_custom(msg):
         m.throws_logic_error()
     assert msg(excinfo.value) == "this error should fall through to the standard handler"
 
+    # OverFlow error translation.
+    with pytest.raises(OverflowError) as excinfo:
+        m.throws_overflow_error()
+
     # Can we handle a helper-declared exception?
     with pytest.raises(m.MyException5) as excinfo:
         m.throws5()