Bruce Merry 37de2da9dd Access C++ hash functions from Python and vice versa (#1034) ...

There are two separate additions:

1. `py::hash(obj)` is equivalent to the Python `hash(obj)`.
2. `.def(hash(py::self))` registers the hash function defined by
   `std::hash<T>` as the Python hash function.

2017-08-30 14:22:00 +02:00

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