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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Wrong exception deduction for some forms of placement new"
href="https://bugs.llvm.org/show_bug.cgi?id=38300">38300</a>
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<th>Summary</th>
<td>Wrong exception deduction for some forms of placement new
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</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
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<th>Reporter</th>
<td>zhonghao@pku.org.cn
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</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvm-bugs@lists.llvm.org
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<pre>clang version 7.0.0 (trunk 337118) rejects the following program:
//--
#include <new>
int n;
static_assert(!noexcept(::new (std::nothrow) int[n]), "");
//--
Further the following program aborts even though it shouldn't:
//---
#include <new>
extern "C" void abort();
void test_too_small(int n) {
new (std::nothrow) int[n]{1,2,3,4};
}
int main()
{
bool f = false;
try {
test_too_small(3);
} catch (...) {
f = true;
}
if (!f)
abort();
}
//---
Rationale: According to [expr.new] p7:
"[..] if the new-initializer is a bracedinit-list for which the number of
initializer-clauses exceeds the number of elements to initialize, no storage
is obtained and the new-expression terminates by throwing an exception of a
type that would match a handler (15.3) of type std::bad_array_new_length
(18.6.2.2)."
I tried g++. It accept both code samples, and the second code sample does not
abort.</pre>
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