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2bfc7324d4
GCC-14 rightly points out that the constructor of `atomic_cell_view`
is marked private, and cannot be called from its formatter:
```
/usr/bin/g++-14 -DDEBUG -DDEBUG_LSA_SANITIZER -DFMT_SHARED -DSANITIZE -DSCYLLA_BUILD_MODE=debug -DSCYLLA_ENABLE_ERROR_INJECTION -DSEASTAR_API_LEVEL=7 -DSEASTAR_DEBUG -DSEASTAR_DEBUG_PROMISE -DSEASTAR_DEBUG_SHARED_PTR -DSEASTAR_DEFAULT_ALLOCATOR -DSEASTAR_LOGGER_COMPILE_TIME_FMT -DSEASTAR_LOGGER_TYPE_STDOUT -DSEASTAR_SCHEDULING_GROUPS_COUNT=16 -DSEASTAR_SHUFFLE_TASK_QUEUE -DSEASTAR_SSTRING -DSEASTAR_TYPE_ERASE_MORE -DXXH_PRIVATE_API -DCMAKE_INTDIR=\"Debug\" -I/var/ssd/scylladb -I/var/ssd/scylladb/build/gen -I/var/ssd/scylladb/seastar/include -I/var/ssd/scylladb/build/seastar/gen/include -I/var/ssd/scylladb/build/seastar/gen/src -g -Og -g -gz -std=gnu++20 -fvisibility=hidden -Wall -Werror -Wextra -Wno-error=deprecated-declarations -Wimplicit-fallthrough -Wno-deprecated-copy -Wno-mismatched-tags -Wno-missing-field-initializers -Wno-overloaded-virtual -Wno-unused-parameter -ffile-prefix-map=/var/ssd/scylladb=. -march=westmere -Wstack-usage=40960 -U_FORTIFY_SOURCE -Wno-maybe-uninitialized -Werror=unused-result -fstack-clash-protection -fsanitize=address -fsanitize=undefined -fno-sanitize=vptr -MD -MT mutation/CMakeFiles/mutation.dir/Debug/atomic_cell.cc.o -MF mutation/CMakeFiles/mutation.dir/Debug/atomic_cell.cc.o.d -o mutation/CMakeFiles/mutation.dir/Debug/atomic_cell.cc.o -c /var/ssd/scylladb/mutation/atomic_cell.cc
In file included from /var/ssd/scylladb/mutation/atomic_cell.cc:9:
/var/ssd/scylladb/mutation/atomic_cell.hh: In member function ‘auto fmt::v10::formatter<atomic_cell>::format(const atomic_cell&, fmt::v10::format_context&) const’:
/var/ssd/scylladb/mutation/atomic_cell.hh:413:67: error: ‘atomic_cell_view::atomic_cell_view(basic_atomic_cell_view<is_mutable>) [with mutable_view is_mutable = mutable_view::yes]’ is private within this context
413 | return fmt::format_to(ctx.out(), "{}", atomic_cell_view(ac));
| ^
/var/ssd/scylladb/mutation/atomic_cell.hh:275:5: note: declared private here
275 | atomic_cell_view(basic_atomic_cell_view<is_mutable> view)
| ^~~~~~~~~~~~~~~~
```
so, in this change, we make the formatter a friend of
`atomic_cell_view`.
since the operator<< was dropped, there is no need to keep its friend
declaration around, so it is dropped in this change.
Signed-off-by: Kefu Chai <kefu.chai@scylladb.com>
Closes scylladb/scylladb#18081