Jason Rhinelander 929009954b Expose more instance management functions ... This breaks up the instance management functions in class_support.h a little bit so that other pybind11 code can use it. In particular: - added make_new_instance() which does what pybind11_object_new does, but also allows instance allocation without `value` allocation. This lets `cast.h` use the same instance allocation rather than having its own separate implementation. - instance registration is now moved to a `register_instance()`/deregister_instance()` pair (rather than having individual code add or remove things from `registered_instances` directory). - clear_instance() does everything `pybind11_object_dealloc()` needs except for the deallocation; this is helpful for factory construction which needs to be able to replace the internals of an instance without deallocating it. - clear_instance() now also calls `dealloc` when `holder_constructed` is true, even if `value` is false. This can happen in factory construction when the pointer is moved from one instance to another, but the holder itself is only copied (i.e. for a shared_ptr holder).		2017-04-27 09:12:41 -04:00
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pybind11	Expose more instance management functions	2017-04-27 09:12:41 -04:00