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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - __has_trivial_destructor(_Atomic(int)) should be true (and other issues)"
href="https://bugs.llvm.org/show_bug.cgi?id=41284">41284</a>
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<th>Summary</th>
<td>__has_trivial_destructor(_Atomic(int)) should be true (and other issues)
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>enhancement
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>C++
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>comexk@gmail.com
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<th>CC</th>
<td>blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<p>
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<pre>More generally, using raw _Atomic types rather than the std::atomic<T> wrapper
(e.g. in a -nostdinc context) is less ergonomic than it could be.
__has_trivial_destructor(_Atomic(int)) returns false, and attempting to
destruct one using a generic wrapper produces an error:
template <typename T>
void destruct(T *t) {
t->~T();
}
void a(_Atomic(int) *p) { destruct(p); }
->
<source>:3:6: error: object expression of non-scalar type '_Atomic(int)' cannot
be used in a pseudo-destructor expression
Also, although this is probably more effort to implement, Clang can't deduce
the parameter of an _Atomic() type:
template <typename T>
struct X;
template <typename T>
struct X<_Atomic(T)> {};
->
<source>:4:8: error: class template partial specialization contains a template
parameter that cannot be deduced; this partial specialization will never be
used [-Wunusable-partial-specialization]
Since these types are not defined by the C++ standard, there's no normative
answer on whether the current behavior is correct, but I think it would make
more sense if they worked closer to how one would expect.</pre>
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