Compiling the attached C++0x program fails on 4.5 but is successful in 4.4. I think the root cause is the missing nullptr support but that doesn't make it any more useful for 4.5.
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Summary: Not possible to compare unique_ptr with 0
Product: gcc
Version: 4.5.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: gcc at magfr dot user dot lysator dot liu dot se
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42925
