Info Catalog ccmode: Hanging Braces ccmode: Custom Auto-newlines ccmode: Hanging Semicolons and Commas

ccmode: Hanging Colons

 
 8.2 Hanging Colons
 ==================
 
 Using a mechanism similar to brace hanging (Hanging Braces),
 colons can also be made to hang using the style variable
 ‘c-hanging-colons-alist’: when a colon is typed, CC Mode determines its
 syntactic context, looks this up in the alist ‘c-changing-colons-alist’
 and inserts up to two newlines accordingly.  Here, however, If CC Mode
 fails to find an entry for a syntactic symbol in the alist, no newlines
 are inserted around the newly typed colon.
 
  -- User Option: c-hanging-colons-alist
 
      The Key: the syntactic symbol
           The syntactic symbols appropriate as keys in this association
           list are: ‘case-label’, ‘label’, ‘access-label’,
           ‘member-init-intro’, and ‘inher-intro’.  Syntactic
           Symbols.  Elements with any other value as a key get
           ignored.
 
      The associated value: the “ACTION” list
           The ACTION here is simply a list containing a combination of
           the symbols ‘before’ and ‘after’.  Unlike in
           ‘c-hanging-braces-alist’, functions as ACTIONS are not
           supported; there doesn’t seem to be any need for them.
 
    In C++, double-colons are used as a scope operator but because these
 colons always appear right next to each other, newlines before and after
 them are controlled by a different mechanism, called “clean-ups” in CC
 Mode.  Clean-ups, for details.
 

Info Catalog ccmode: Hanging Braces ccmode: Custom Auto-newlines ccmode: Hanging Semicolons and Commas