[llvm-bugs] [Bug 28591] New: Can't implicitly cast from class with multiple inheritance to a base of a virtually base class if public inheritance follows after private or protected, but not before them

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=28591

            Bug ID: 28591
           Summary: Can't implicitly cast from class with multiple
                    inheritance to a base of a virtually base class if
                    public inheritance follows after private or protected,
                    but not before them
           Product: clang
           Version: 3.1
          Hardware: PC
                OS: MacOS X
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: maxim.mishchenko at gmail.com
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org
    Classification: Unclassified

# version: clang-703.0.31, 
# sample.cpp

class foo {};
class foofoo: public foo {};
class private_bar: private virtual foofoo {};
class public_bar: public virtual foofoo {};
class foobar_public_first: public public_bar, public private_bar {};
class foobar_private_first: public private_bar, public public_bar {};

void test_foobar() {
    foo *foo1 = new foobar_public_first(); // OK
    foo *foo2 = new foobar_private_first(); // compile error - "Cannot cast
'foobar_private_first' to its private base class 'foo'"
}

So, availability of casting to base depends on how ancestor classes are ordered
in the inheritance list.

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