http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51436
Markus Trippelsdorf <markus at trippelsdorf dot de> changed:
What |Removed |Added
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CC| |markus at trippelsdorf dot
| |de
--- Comment #1 from Markus Trippelsdorf <markus at trippelsdorf dot de>
2011-12-06 10:31:20 UTC ---
Slightly smaller testcase:
typedef long unsigned size_t;
extern "C" void *memcpy (void *, __const void *, size_t);
template < class Dest, class Source > struct BitCastHelper {
static Dest cast (const Source & source) __attribute__ ((always_inline)) {
Dest dest;
memcpy (0, &source, sizeof dest);
}
};
template < class Dest, class Source > Dest BitCast (Source)
{
BitCastHelper < Dest, Source >::cast (0);
}
class MaybeObject
{
};
class Object:MaybeObject
{
public:
static Object *cast (Object *) {
}
};
class HeapObject:public Object
{
};
class String:public HeapObject
{
};
class ExternalString:public String
{
};
class ExternalTwoByteString:public ExternalString
{
};
template < typename T > class Handle
{
public:
Handle () {
}
T *operator* () const;
template < class S > static Handle < T > cast (Handle < S > that) {
T::cast (*that);
}
T **location_;
};
template < typename T > T * Handle < T >::operator* () const
{
*BitCast < T ** >(location_);
}
void
TestCharacterStream ()
{
Handle < String > uc16_string;
Handle < ExternalTwoByteString >::cast (uc16_string);
}
