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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 - Can std::allocator{}.deallocate non allocate()d pointer during constant evaluation"
href="https://bugs.llvm.org/show_bug.cgi?id=49465">49465</a>
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<th>Summary</th>
<td>Can std::allocator{}.deallocate non allocate()d pointer during constant evaluation
</td>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>URL</th>
<td>https://godbolt.org/z/KbWKcx
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Keywords</th>
<td>accepts-invalid
</td>
</tr>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>C++2a
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>johelegp@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>blitzrakete@gmail.com, erik.pilkington@gmail.com, johelegp@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<p>
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<pre>See <a href="https://godbolt.org/z/KbWKcx">https://godbolt.org/z/KbWKcx</a>.
```C++
#include<memory>
struct dyn_array {
int* beg{};
// ...
constexpr void reserve(unsigned) {
// ...
std::allocator<int>{}.deallocate(beg, 0);
}
};
static_assert([] {
dyn_array a;
a.reserve(42);
return a;
}().beg == nullptr);
```</pre>
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