[C++0x] unordered_map doesn't support cp-ctor.

[pluto@…]

hi,

during compiling following testcase on gcc-4.6 snapshot i get an error.

#include <boost/unordered_map.hpp>

struct S
{
        boost::unordered_map<const void*, int > m_;
};

boost::unordered_map<const void*, S> m2_;

void foo ( const void* p )
{               
        S s;
        m2_.insert ( std::make_pair ( p, s ) );
}

(...)
include/c++/4.6.0/bits/stl_pair.h:110:17:
   error: 'constexpr std::pair<_T1, _T2>::pair(const std::pair<_T1, _T2>&)
   [with _T1 = const void* const, _T2 = S, std::pair<_T1, _T2>
      = std::pair<const void* const, S>]' is implicitly deleted because
          the default definition would be ill-formed:
.../include/c++/4.6.0/bits/stl_pair.h:110:17:
   error: use of deleted function 'S::S(const S&)

the major problem is a lack of copy constructor in unordered_map when compiled with -std=gnu++0x. the !defined(BOOST_NO_RVALUE_REFERENCES) activates only move semantics while documentation describes cp-ctor. http://www.boost.org/doc/libs/1_45_0/doc/html/boost/unordered_map.html#id1354372-bb

GCC bugzilla entry about this issue: ​http://gcc.gnu.org/PR47417

[Daniel James]

(In [68445]) Add copy constructors and assignment operators when using rvalue references. Refs #5119.

[Daniel James]

That will hopefully fix it, but it's too late for 1.46.

I'm still seeing a lot of failures for gcc 4.6, but they also show up on gcc 4.5 and all seem to be exception related. Since they're not showing up on the regression tests, I suspect this is a problem with the macports version of gcc rather than a bug in boost or gcc in general.

[Daniel James]

(In [69469]) Add copy constructors and assignment operators when using rvalue references. Fixes #5119.