id,summary,reporter,owner,description,type,status,milestone,component,version,severity,resolution,keywords,cc
8668,BOOST_FOREACH breaks on clang 3.2 but not on gcc 4.7.2,juxeii@…,Eric Niebler,"Consider this snippet:

{{{
#include <vector>
#include <boost/foreach.hpp>

class A : public std::vector<int>
{
public:
    template <class T>
    operator const T &() const;   
};

void foo(){
   A colA;
   int b = 1;
   BOOST_FOREACH(b, colA)
   {
        ;
   } 
}
}}}

clang 3.2 throws this error:

{{{
error: conditional expression is ambiguous; 'rvalue_probe<A>' can be converted to 'A' and vice versa BOOST_FOREACH(b, colA)

expanded from macro 'BOOST_FOREACH' f (boost::foreach_detail_::auto_any_t BOOST_FOREACH_ID(_foreach_col) = BOOST_FOREACH_CONTAIN(COL))

expanded from macro 'BOOST_FOREACH_CONTAIN' BOOST_FOREACH_EVALUATE(COL)

expanded from macro 'BOOST_FOREACH_EVALUATE' (true ? boost::foreach_detail_::make_probe((COL), BOOST_FOREACH_ID(_foreach_is_rvalue)) : (COL))
}}}

gcc in version 4.7.2 compiles this snippet with no error.
Is this a bug of gcc, clang or boost?
",Bugs,closed,To Be Determined,foreach,Boost 1.52.0,Problem,wontfix,,