[Bug libstdc++/81857] istreambuf_iterator not work as input iterator

2017-08-25 Thread abominable-snowman at yandex dot ru 
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81857

--- Comment #3 from Petr Ovtchenkov  ---
Created attachment 42042
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42042=edit
proposed test for issue

https://gcc.gnu.org/ml/libstdc++/2017-08/msg00036.html

May be worth to add (see issue2471) words to copy_n spec:

 "copy_n return result + n (i.e. increment OutputIterator n times) and
  increment InputIterator max(0, n - 1)."

to avoid ambiguity?

[Bug libstdc++/81857] istreambuf_iterator not work as input iterator

2017-08-23 Thread abominable-snowman at yandex dot ru 
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81857

--- Comment #2 from Petr Ovtchenkov  ---
Related problem: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=50119,
commit 1a1dad283 in git's reflection.

[Bug libstdc++/81857] istreambuf_iterator not work as input iterator

2017-08-22 Thread rs2740 at gmail dot com 
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81857

TC  changed:

   What|Removed |Added

 CC||rs2740 at gmail dot com

--- Comment #1 from TC  ---
istreambuf_iterator is specified to call sbumpc() only on increment, not upon
construction; the implementation is as specified.

The copy_n aspect is https://cplusplus.github.io/LWG/issue2471.