* Span/SpanGroup: wrap SpanC in shared_ptr
When a Span that was retrieved from a SpanGroup was modified, these
changes were not reflected in the SpanGroup because the underlying
SpanC struct was copied.
This change applies the solution proposed by @nrodnova, to wrap SpanC in
a shared_ptr. This makes a SpanGroup and Spans derived from it share the
same SpanC. So, changes made through a Span are visible in the SpanGroup
as well.
Fixes#9556
* Test that a SpanGroup is modified through its Spans
* SpanGroup.push_back: remove nogil
Modifying std::vector is not thread-safe.
* C++ >= 11 does not allow const T in vector<T>
* Add Span.span_c as a shorthand for Span.c.get
Since this method is cdef'ed, it is only visible from Cython, so we
avoid using raw pointers in Python
Replace existing uses of span.c.get() to use this new method.
* Fix formatting
* Style fix: pointer types
* SpanGroup.to_bytes: reduce number of shared_ptr::get calls
* Mark SpanGroup modification test with issue
Co-authored-by: Sofie Van Landeghem <svlandeg@users.noreply.github.com>
Co-authored-by: Sofie Van Landeghem <svlandeg@users.noreply.github.com>
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