[LLVMbugs] [Bug 13485] New: Templates mess up return type covariance analysis

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Mon Jul 30 18:15:22 PDT 2012


             Bug #: 13485
           Summary: Templates mess up return type covariance analysis
           Product: clang
           Version: trunk
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: clangbugs.sxeraverx at spamgourmet.com
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 8966
  --> http://llvm.org/bugs/attachment.cgi?id=8966
failing test case

test.cpp:9:15: error: return type of virtual function 'foo' is not covariant
      with the return type of the function it overrides ('C *' is not derived
      from 'A *')
  virtual TC *foo() {return this;};
test.cpp:12:18: note: in instantiation of template class 'B<C>' requested here
class C : public B<C>
test.cpp:4:14: note: overridden virtual function is here
  virtual A* foo()=0;
1 error generated.

C is derived from A through B<C>

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