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CC Mode provides some tools to help keep the line continuation backslashes in macros neat and tidy. Their precise action is customized with these variables:
These variables control the alignment columns for line
continuation backslashes in multiline macros. They are used
by the functions that automatically insert or align such
backslashes, e.g., c-backslash-region and
c-context-line-break.
c-backslash-column specifies the minimum
column for the backslashes. If any line in the macro goes
past this column, then the next tab stop (i.e., next multiple
of tab-width) in that line is used as the
alignment column for all the backslashes, so that they remain
in a single column. However, if any lines go past
c-backslash-max-column then the backslashes in
the rest of the macro will be kept at that column, so that
the lines which are too long “stick out”
instead.
Don’t ever set these variables to nil.
If you want to disable the automatic alignment of
backslashes, use c-auto-align-backslashes.
Align automatically inserted line continuation backslashes
if non-nil. When line continuation backslashes
are inserted automatically for line breaks in multiline
macros, e.g., by c-context-line-break, they are
aligned with the other backslashes in the same macro if this
flag is set.
If c-auto-align-backslashes is
nil, automatically inserted backslashes are
preceded by a single space, and backslashes get aligned only
when you explicitly invoke the command
c-backslash-region (C-c C-\).