This changes the varobj iteration code to use a C++ class rather than
a C struct with a separate "ops" structure. The only implementation
is updated to use inheritance. This simplifies the code quite nicely.
gdb/ChangeLog
2020-12-11 Tom Tromey <tom@tromey.com>
* varobj.c (update_dynamic_varobj_children, install_visualizer)
(varobj::~varobj): Update.
* varobj-iter.h (struct varobj_iter): Change to interface class.
(struct varobj_iter_ops): Remove.
(varobj_iter_next, varobj_iter_delete): Remove.
* python/py-varobj.c (struct py_varobj_iter): Derive from
varobj_iter. Add constructor, destructor. Rename members.
(py_varobj_iter::~py_varobj_iter): Rename from
py_varobj_iter_dtor.
(py_varobj_iter::next): Rename from py_varobj_iter_next.
(py_varobj_iter_ops): Remove.
(py_varobj_iter): Rename from py_varobj_iter_ctor.
(py_varobj_iter_new): Remove.
(py_varobj_get_iterator): Update.
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