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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - addressof returns wrong address when there is user provided conversion operator to char&"
href="http://llvm.org/bugs/show_bug.cgi?id=15754">15754</a>
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<th>Summary</th>
<td>addressof returns wrong address when there is user provided conversion operator to char&
</td>
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<th>Product</th>
<td>libc++
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>All
</td>
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<th>OS</th>
<td>All
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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>All Bugs
</td>
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<th>Assignee</th>
<td>hhinnant@apple.com
</td>
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<th>Reporter</th>
<td>tuhertz@gmail.com
</td>
</tr>
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre>addressof uses plain c style cast, so type conversion operator is invoked when
argument type T has user-defined conversion operator to char& like this:
struct nothing {
operator char&()
{
static char c;
return c;
}
};
one way to fix this is using reinterpret_cast:
<a href="http://www.boost.org/doc/libs/release/boost/utility/addressof.hpp">http://www.boost.org/doc/libs/release/boost/utility/addressof.hpp</a>
template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
_Tp*
addressof(_Tp& __x) _NOEXCEPT
{
return reinterpret_cast<_Tp*>(&const_cast<char&>(reinterpret_cast<const
volatile char&>(__x)));
}
this code adding const volatile to char& and remove it for allowing addressof
to be called with const or volatile type _Tp.</pre>
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