Re: [Boost-bugs] [Boost C++ Libraries] #8564: Variable hiding errors within nested let blocks in Phoenix

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #8564: Variable hiding errors within nested let blocks in Phoenix
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2014-02-09 12:20:33

#8564: Variable hiding errors within nested let blocks in Phoenix
-------------------------------+---------------------
  Reporter:  miremare@…        |      Owner:  theller
      Type:  Bugs              |     Status:  new
 Milestone:  To Be Determined  |  Component:  phoenix
   Version:  Boost 1.53.0      |   Severity:  Problem
Resolution:                    |   Keywords:
-------------------------------+---------------------

Comment (by John Fletcher <J.P.Fletcher@…>):

 Further work has shown that these cases work as expected:
 {{{
   {
     int z = 3;
     int y = 0;
     int x = (phoenix::let(_a = 1, _b = 2)[phoenix::let(_b = _a)[ _a
 ]])(y);
   }
 }}}
 {{{
   {
     int y = 0;
     int x = (phoenix::let(_a = 1, _b = 2)[phoenix::let(_b = _1)[ _a
 ]])(y);
   }
 }}}
 {{{
   {
     int y = 0;
     int x = (phoenix::let(_a = 1, _b = 2)[phoenix::let(_b = 1)[_b]])();
   }  // This works....
 }}}
 but this case fails:
 {{{
   {
     int y = 0;
     int x = (phoenix::let(_a = 1, _b = 2)[phoenix::let(_b = 1)[_a]])();
   }
 }}}
 Reference to _a in the inner loop is the problem, but only when _b is set
 to a constant!!

 Further investigation is in progress.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/8564#comment:2>
Boost C++ Libraries <http://www.boost.org/>
Boost provides free peer-reviewed portable C++ source libraries.