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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - dynamic_cast prohibited due to wrongly detecting ambiguity"
href="http://llvm.org/bugs/show_bug.cgi?id=19795">19795</a>
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<th>Summary</th>
<td>dynamic_cast prohibited due to wrongly detecting ambiguity
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>C++
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>david.majnemer@gmail.com
</td>
</tr>
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<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
</td>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>consider:
struct X { virtual void fun(); };
struct V : public X {};
struct W : private virtual V {};
struct Y : private W, public virtual V {};
void f(Y *x) {
(void)dynamic_cast<X*>(x);
}
we diagnose with:
<stdin>:7:9: error: cannot cast 'Y' to its private base class 'X'
(void)dynamic_cast<X*>(x);
^
<stdin>:3:12: note: constrained by private inheritance here
struct W : private virtual V {};
^~~~~~~~~~~~~~~~~
However, Y publicly inherits from virtual V. GCC, ICC and MSVC all believe
that this is legit.</pre>
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