id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
7876	container::map fails with unions	p.brockamp@…	Ion Gaztañaga	"Hello,

At least in boost 1.52.0 there seems to be a problem with container::map and the use of unions (and I suppose the problem might exist with similar types like container::set, etc., though I haven't tested it). Try this code snippet to reproduce:

{{{
#include <map>
#include <boost/container/map.hpp>

union TU {};
void boostMapFail(void) {
  std::map             <unsigned int, TU> stdTest;
  boost::container::map<unsigned int, TU> boostTest;
  TU                                      u;
  stdTest[5U]   = u; // Does compile    :-)
  boostTest[5U] = u; // Fails miserably :-(
}
}}}

This fails under and MSVC2005 and GCC 4.3:

MSVC2005:
boost/move/move.hpp(254) : error C2569: 'TU' : enum/union cannot be used as a base class

GCC 4.3:
boost/move/move.hpp:254: error: base type 'TU' fails to be a struct or class type

On the contrary, using std::map instead of boost::container::map *does* compile without a hitch, so I would expect boost to behave identically.

Best regards

Peter
"	Bugs	closed	To Be Determined	container	Boost 1.52.0	Problem	fixed	container map union	matekm@…