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added note about trailing commas (fixes #593)

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Wenzel Jakob 2017-03-22 21:39:19 +01:00
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docs/advanced/classes.rst
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@ -230,6 +230,13 @@ override the ``name()`` method):
std::string bark() override { PYBIND11_OVERLOAD(std::string, Dog, bark, ); }
};
.. note::
Note the trailing commas in the ``PYBIND11_OVERLOAD`` calls to ``name()``
and ``bark()``. These are needed to portably implement a trampoline for a
function that does not take any arguments. For functions that take
a nonzero number of arguments, the trailing comma must be omitted.
A registered class derived from a pybind11-registered class with virtual
methods requires a similar trampoline class, *even if* it doesn't explicitly
declare or override any virtual methods itself: