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Ticket #6396: Implicit instanciation of boost::rv for non-cass types generates an error

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[SVN r76508]
This commit is contained in:
Ion Gaztañaga
2012-01-15 12:24:52 +00:00
parent 0f7fe1fc3f
commit 71fbccf71e
1 changed files with 22 additions and 1 deletions
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23
include/boost/move/move.hpp
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@ -225,13 +225,32 @@
namespace boost {
namespace move_detail {
template<class T>
struct is_class_or_union
{
struct twochar { char _[2]; };
template <class U>
static char is_class_or_union_tester(void(U::*)(void));
template <class U>
static twochar is_class_or_union_tester(...);
static const bool value = sizeof(is_class_or_union_tester<T>(0)) == sizeof(char);
};
struct empty{};
}
//////////////////////////////////////////////////////////////////////////////
//
// struct rv
//
//////////////////////////////////////////////////////////////////////////////
template <class T>
class rv : public T
class rv
: public BOOST_MOVE_MPL_NS::if_c
< ::boost::move_detail::is_class_or_union<T>::value
, T
, ::boost::move_detail::empty
>::type
{
rv();
~rv();
@ -239,6 +258,8 @@
void operator=(rv const&);
} BOOST_MOVE_ATTRIBUTE_MAY_ALIAS;
//////////////////////////////////////////////////////////////////////////////
//
// move_detail::is_rv