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  • Dean Moldovan's avatar
    Make all classes with the same instance size derive from a common base · 08cbe8df
    Dean Moldovan authored 
    In order to fully satisfy Python's inheritance type layout requirements,
all types should have a common 'solid' base. A solid base is one which
has the same instance size as the derived type (not counting the space
required for the optional `dict_ptr` and `weakrefs_ptr`). Thus, `object`
does not qualify as a solid base for pybind11 types and this can lead to
issues with multiple inheritance.

To get around this, new base types are created: one per unique instance
size. There is going to be very few of these bases. They ensure Python's
MRO checks will pass when multiple bases are involved.
    08cbe8df
test_multiple_inheritance.cpp 4.49 KB