Re: [Boost-bugs] [Boost C++ Libraries] #5475: [Foreach] rvalue reference binding of temporary ranges

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #5475: [Foreach] rvalue reference binding of temporary ranges
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2011-09-22 18:39:52

#5475: [Foreach] rvalue reference binding of temporary ranges
--------------------------------------+-------------------------------------
  Reporter:  mimomorin@…              |       Owner:  eric_niebler  
      Type:  Patches                  |      Status:  assigned      
 Milestone:  To Be Determined         |   Component:  foreach       
   Version:  Boost Development Trunk  |    Severity:  Problem       
Resolution:                           |    Keywords:  foreach, C++0x
--------------------------------------+-------------------------------------

Comment (by Michel Morin <mimomorin@…>):

 The problem in MSVC is that it does the access check of the copy
 constructor when binding references to rvalues
 even when the check should not occur. (In C++03, the check is legal.)

 Here is a minimal code that demonstrates this.
 {{{
 class noncopyable
 {
 public:
     noncopyable()
     {}

 private:
     noncopyable(noncopyable const &);
 };

 int main (int argc, char* argv[])
 {
     noncopyable const& x = noncopyable();

     return 0;
 }
 }}}
 This code fails to compile on MSVC, but compiles fine on Comeau.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/5475#comment:14>
Boost C++ Libraries <http://www.boost.org/>
Boost provides free peer-reviewed portable C++ source libraries.