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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Overloads of atomic_fetch_meow(atomic<T*>*, ...) are non-conforming"
href="https://bugs.llvm.org/show_bug.cgi?id=47908">47908</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Overloads of atomic_fetch_meow(atomic<T*>*, ...) are non-conforming
</td>
</tr>
<tr>
<th>Product</th>
<td>libc++
</td>
</tr>
<tr>
<th>Version</th>
<td>11.0
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Windows NT
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>All Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>Casey@Carter.net
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, mclow.lists@gmail.com
</td>
</tr></table>
<p>
<div>
<pre><atomic> includes overloads:
template <class _Tp>
_LIBCPP_INLINE_VISIBILITY
_Tp*
atomic_fetch_add(volatile atomic<_Tp*>* __o, typename
atomic<_Tp*>::difference_type __op) _NOEXCEPT
{
return __o->fetch_add(__op);
}
template <class _Tp>
_LIBCPP_INLINE_VISIBILITY
_Tp*
atomic_fetch_add(atomic<_Tp*>* __o, typename atomic<_Tp*>::difference_type
__op) _NOEXCEPT
{
return __o->fetch_add(__op);
}
template <class _Tp>
_LIBCPP_INLINE_VISIBILITY
_Tp*
atomic_fetch_add_explicit(volatile atomic<_Tp*>* __o, typename
atomic<_Tp*>::difference_type __op, memory_order __m) _NOEXCEPT
{
return __o->fetch_add(__op, __m);
}
template <class _Tp>
_LIBCPP_INLINE_VISIBILITY
_Tp*
atomic_fetch_add_explicit(atomic<_Tp*>* __o, typename
atomic<_Tp*>::difference_type __op, memory_order __m) _NOEXCEPT
{
return __o->fetch_add(__op, __m);
}
template <class _Tp>
_LIBCPP_INLINE_VISIBILITY
_Tp*
atomic_fetch_sub(volatile atomic<_Tp*>* __o, typename
atomic<_Tp*>::difference_type __op) _NOEXCEPT
{
return __o->fetch_sub(__op);
}
template <class _Tp>
_LIBCPP_INLINE_VISIBILITY
_Tp*
atomic_fetch_sub(atomic<_Tp*>* __o, typename atomic<_Tp*>::difference_type
__op) _NOEXCEPT
{
return __o->fetch_sub(__op);
}
template <class _Tp>
_LIBCPP_INLINE_VISIBILITY
_Tp*
atomic_fetch_sub_explicit(volatile atomic<_Tp*>* __o, typename
atomic<_Tp*>::difference_type __op, memory_order __m) _NOEXCEPT
{
return __o->fetch_sub(__op, __m);
}
template <class _Tp>
_LIBCPP_INLINE_VISIBILITY
_Tp*
atomic_fetch_sub_explicit(atomic<_Tp*>* __o, typename
atomic<_Tp*>::difference_type __op, memory_order __m) _NOEXCEPT
{
return __o->fetch_sub(__op, __m);
}
which don't appear in the Standard. This wouldn't be an issue, except for the
fact that e.g. `atomic_fetch_add<int*>` doesn't name a specialization of the
`atomic_fetch_add` overload that takes `atomic<T*>`, it names a specialization
of the `atomic_fetch_add` overload that takes `atomic<T>` which is
unfortunately constrained to reject argument types that aren't integral and
non-`bool`.
Conforming programs that pass pointer type arguments via explicit template
argument lists to these `atomic_fetch_meow` overloads will fail to compile,
e.g., <a href="https://godbolt.org/z/q7b6Yj">https://godbolt.org/z/q7b6Yj</a>.</pre>
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