Jason Rhinelander 23bf894590 Override deduced Base class when defining Derived methods ... When defining method from a member function pointer (e.g. `.def("f", &Derived::f)`) we run into a problem if `&Derived::f` is actually implemented in some base class `Base` when `Base` isn't pybind-registered. This happens because the class type is deduced from the member function pointer, which then becomes a lambda with first argument this deduced type. For a base class implementation, the deduced type is `Base`, not `Derived`, and so we generate and registered an overload which takes a `Base *` as first argument. Trying to call this fails if `Base` isn't registered (e.g. because it's an implementation detail class that isn't intended to be exposed to Python) because the type caster for an unregistered type always fails. This commit adds a `method_adaptor` function that rebinds a member function to a derived type member function and otherwise (i.e. regular functions/lambda) leaves the argument as-is. This is now used for class definitions so that they are bound with type being registered rather than a potential base type. A closely related fix in this commit is to similarly update the lambdas used for `def_readwrite` (and related) to bind to the class type being registered rather than the deduced type so that registering a property that resolves to a base class member similarly generates a usable function. Fixes #854, #910. Co-Authored-By: Dean Moldovan <dean0x7d@gmail.com>		2017-07-03 17:28:45 -04:00
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pybind11	Override deduced Base class when defining Derived methods	2017-07-03 17:28:45 -04:00