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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Inaccessible base not diagnosed in expression using the pointer-to-member operators"
href="http://llvm.org/bugs/show_bug.cgi?id=19274">19274</a>
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<th>Summary</th>
<td>Inaccessible base not diagnosed in expression using the pointer-to-member operators
</td>
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<th>Product</th>
<td>clang
</td>
</tr>
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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>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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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
</td>
</tr>
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<th>Reporter</th>
<td>filip.roseen@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=12307" name="attach_12307" title="testcase.cpp">attachment 12307</a> <a href="attachment.cgi?id=12307&action=edit" title="testcase.cpp">[details]</a></span>
testcase.cpp
struct A { int a = 0; };
struct B : private A { };
int
main (int argc, char *argv[])
{
int A::* ptr = &A::a;
B ().*ptr; // ill-formed
}
----------------------------------------------------------------
The following should issue a diagnostic saying that our source is ill-formed,
`clang` however compiles and accepts it. `A` is not an accessible base of `B`,
therefore the line marked `// ill-formed` should error.
`gcc` shows the correct behaviour with the following diagnostic:
<span class="quote">> testcase.cpp: In function ‘int main(int, char**)’:
> testcase.cpp:9:9: error: ‘A’ is an inaccessible base of ‘B’
> B ().*ptr; // ill-formed</span >
[expr.mptr.oper]p2 states the following:
> The binary operator `.*` binds its second operand, which shall be
> of type "pointer to member of T", to its first operand, which
> shall be of class T or of a class of which T is an unambiguous and
> accessible base class. The result is an object or a function of
> the type specified by the second operand.
[ Note: the same applies to `->*` ]</pre>
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