Re: [Boost-bugs] [Boost C++ Libraries] #9851: Iterators from rang have different category than the range

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #9851: Iterators from rang have different category than the range
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2014-05-06 11:10:12

#9851: Iterators from rang have different category than the range
-------------------------------+------------------------
  Reporter:  anonymous         |      Owner:  neilgroves
      Type:  Bugs              |     Status:  assigned
 Milestone:  To Be Determined  |  Component:  range
   Version:  Boost 1.55.0      |   Severity:  Problem
Resolution:                    |   Keywords:
-------------------------------+------------------------
Changes (by neilgroves):

 * status:  new => assigned

Comment:

 The reason you originally get 5,3 as a result is because the Filtered
 adaptor requires a ForwardPassRange since it needs to check adjacent
 elements.

 http://www.boost.org/doc/libs/1_55_0/libs/range/doc/html/range/reference/adaptors/reference/filtered.html


 Your code snippet is legal since it isn't a single-pass range as the
 input. Passing a genuine SinglePassRange to an adaptor requiring a
 ForwardRange will typically trigger a compile-time error with a Concept
 Assert. Having looked through the code I can see that I should add some
 more concept assert statements to ensure invalid code fails to compile.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/9851#comment:3>
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