RE: Pike 8.0 RC1

郭雪松 <[email protected]> Mon, 3 Nov 2014 15:22:01 +0800

Newsgroups	gmane.comp.lang.pike.user
Message-ID	<[email protected]>

Safe index is nice, but if adding a ?(), it would be more useful.
X?(ARGS) should be eauivalent to ((auto _ = X),(_ && _(ARGS)))

o "Safe" index

  Copied from a popular extension to other C-like languages.

  X[?ind] is equivalent to ((auto _ = X),(_ && _[ind]))
  while X?->ind is equivalent to ((auto _ = X),(_ && _->ind))

  The main use is 'deep indexing' where some elements can be 0:

    | request_id?->user?->misc?->x

  vs

    | request_id && request_id->user && request_id->user->misc
    |  && request_id->user->misc->x