CC Mode Manual
4.1.4 Other Electric Commands
A few other keys also provide electric behavior. For example
# (c-electric-pound) is electric when typed as
the first non-whitespace character on a line. In this case, the
variable c-electric-pound-behavior is consulted for the electric
behavior. This variable takes a list value, although the only element
currently defined is alignleft, which tells this command to force
the `#' character into column zero. This is useful for entering
C preprocessor macro definitions.
Stars and slashes (i.e. * and /, c-electric-star and
c-electric-slash respectively) are also electric under
certain circumstances. If a star is inserted as the second character of
a C style block comment on a comment-only line, then the comment
delimiter is indented as defined by c-offsets-alist. A
comment-only line is defined as a line which contains only a comment, as
in:
| |
void spam( int i )
{
// this is a comment-only line...
if( i == 7 ) // but this is not
{
dosomething(i);
}
}
|
Likewise, if a slash is inserted as the second slash in a C++ style line
comment (also only on a comment-only line), then the line is indented as
defined by c-offsets-alist.
Less-than and greater-than signs (c-electric-lt-gt) are also
electric, but only in C++ mode. Hitting the second of two < or
> keys re-indents the line if it is a C++ style stream operator.
The normal parenthesis characters `(' and `)' also reindent
the current line if they are used in normal code. This is useful for
getting the closing parenthesis of an argument list aligned
automatically.
