[Bug c++/28330] New: finds wrong template overload; peculiar diagnostic

["igodard at pacbell dot net" <gcc-bugzilla at gcc dot gnu dot org>]

The error is an invocation of operator<<(ring<cacheRequest>&, loadRequest*).
ring<cacheRequest> defines operator<<(ring<cacheRequest>&, cacheRequest*), and 
cacheRequest is a public base of the actual loadRequest argument. If the right 
argument is explicitly cast to cacheRequest* (as shown in the line immediately 
before the reported error) the correct operator<< is found and invoked.

However, when the argument is the derived class the compiler finds and invokes 
an irrelevant definition of operator<< and then blows up inside it. The 
definition it finds is declared by template wideUint<size_t> and in particular 
by wideUint<1>: operator<<(wideUint<1>, const uint32_t&). Somehow it seems to 
decide that it can turn a ring<cacheRequest>& into a wideUint<1>, and then 
complains that it can't turn a cacheRequest* into a uint32_t (which is a
typedef 
for unsigned int).

It seems to me that the compiler should be able to match the intended operator 
by converting to the base class. However, even if it cannot then shouldn't it 
just say "no match found for ..." rather than accepting the bogus match and
then 
complaining about the conversion to uint32_t?


-- 
           Summary: finds wrong template overload; peculiar diagnostic
           Product: gcc
           Version: 4.0.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: igodard at pacbell dot net


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28330