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Document that type_caster requires default-constructible types

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Dean Moldovan 2017-08-28 14:55:56 +02:00
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docs/advanced/cast/custom.rst
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@ -78,6 +78,12 @@ type is explicitly allowed.
};
}} // namespace pybind11::detail
.. note::
A ``type_caster<T>`` defined with ``PYBIND11_TYPE_CASTER(T, ...)`` requires
that ``T`` is default-constructible (``value`` is first default constructed
and then ``load()`` assigns to it).
.. warning::
When using custom type casters, it's important to declare them consistently