Re: [Boost-bugs] [Boost C++ Libraries] #5566: Spirit.Lex converting a token to its value in a lexer semantic action fails

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #5566: Spirit.Lex converting a token to its value in a lexer semantic action fails
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2013-04-11 23:09:40

#5566: Spirit.Lex converting a token to its value in a lexer semantic action fails
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  Reporter:  Reko Tiira <reko@…>          |       Owner:  hkaiser
      Type:  Bugs                         |      Status:  closed 
 Milestone:  To Be Determined             |   Component:  spirit 
   Version:  Boost 1.46.1                 |    Severity:  Problem
Resolution:  fixed                        |    Keywords:         
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Comment (by hkaiser):

 Replying to [comment:6 Gilles <gillesb68@…>]:
 > Replying to [comment:5 hkaiser]:
 > > Replying to [comment:4 Gilles <gillesb68@…>]:
 > > > What I see from the token's variant is that the value replaces the
 pair of iterators pointing to the matched input sequence. Is there a way
 to store the converted value and, in the same time, keeping the pair of
 iterators pointing to the matched input sequence ?
 > >
 > > Yes, simply use position_token instead of the plain token class.
 >
 > I understand this for a token enclosing the pair pointing the matched
 input sequence alone, but how do I declare a token enclosing together :
 >
 > 1/ the pair of iterators pointing to the matched input sequence; and
 >
 > 2/ the converted value of the same input sequence ?

 Yes, that's what you can do with the `position_token` type. It is
 semantically equivalent to the `token` type, except for the additionally
 stored iterator pair of the matched input sequence. Please see
 libs/example/qi/compiler_tutorial/conjure3 for an example.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/5566#comment:7>
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