ccmode: Macro Backslashes
12.1 Customizing Macro Backslashes
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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:
-- User Option: c-backslash-column
-- User Option: c-backslash-max-column
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’.
-- User Option: 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-\’).