[LLVMbugs] [Bug 12204] New: static_cast to Base class overrides the Derived class field.

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=12204

             Bug #: 12204
           Summary: static_cast to Base class overrides the Derived class
                    field.
           Product: clang
           Version: 3.0
          Platform: PC
        OS/Version: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: nikhil.girdhar at gmail.com
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified


struct Foo {
  Foo() {};
  int i;
  short f;
};
struct Bar : public Foo {
  Bar() {};
  int b;
};


Bar b1, b2;
  b2.i = 0;
  b2.f = 1;
  b2.b = 2;
  b1.i = 3;
  b1.f = 4;
  b1.b = 5;
dynamic_cast<Foo&>(b1) = dynamic_cast<Foo&>(b2);

printf("b1.b = %d");


Output is 2 instead of 5.

static_cast restricted to the base class(Foo) should not have overridden the
Derived class field b. Please clarify.

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