[Boost-bugs] [Boost C++ Libraries] #6026: phoenix block statement tries to copy objects instead of references

Subject: [Boost-bugs] [Boost C++ Libraries] #6026: phoenix block statement tries to copy objects instead of references
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2011-10-14 16:17:15

#6026: phoenix block statement tries to copy objects instead of references
--------------------------------+-------------------------------------------
 Reporter:  armagvvg@…          |       Owner:  theller
     Type:  Bugs                |      Status:  new    
Milestone:  To Be Determined    |   Component:  phoenix
  Version:  Boost 1.47.0        |    Severity:  Problem
 Keywords:                      |  
--------------------------------+-------------------------------------------
 Let's use a simplest class, that can't be copied:

 {{{
 class A {
    A() {}
    A(const A&);
 public:
    static A* construct() { return new A(); }
    const A& operator<<(const char *p) const { return *this; }
 };

 A *pa = A::construct();
 A &a = *pa;

 }}}

 The code which use this object one time normally works:
 {{{
 (boost::phoenix::ref(a) << boost::phoenix::placeholders::_1)("aaa");
 }}}

 But when I try to use this object two times, I get an error:
 {{{
 (
    boost::phoenix::ref(a) << boost::phoenix::placeholders::_1
    ,boost::phoenix::ref(a) << boost::phoenix::placeholders::_1
 )("aaa");
 }}}

 Result: 'A::A' : cannot access private member declared in class 'A'

 Expecting: pass compilation and invoke "A::operator<<" two times.

 Note: preprocessing directive "BOOST_SPIRIT_USE_PHOENIX_V3" was defined.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/6026>
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