Jason Rhinelander acedd6c70c std::reference_wrapper: non-generic types; no None ... This reimplements the std::reference_wrapper<T> caster to be a shell around the underlying T caster (rather than assuming T is a generic type), which lets it work for things like `std::reference_wrapper<int>` or anything else custom type caster with a lvalue cast operator. This also makes it properly fail when None is provided, just as an ordinary lvalue reference argument would similarly fail. This also adds a static assert to test that T has an appropriate type caster. It triggers for casters like `std::pair`, which have return-by-value cast operators. (In theory this could be supported by storing a local temporary for such types, but that's beyond the scope of this PR). This also replaces `automatic` or `take_ownership` return value policies with `automatic_reference` as taking ownership of a reference inside a reference_wrapper is not valid.		2017-05-30 13:14:49 -04:00
..
pybind11	std::reference_wrapper: non-generic types; no None	2017-05-30 13:14:49 -04:00