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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 - The using declaration doesn't work for parent class' constructors."
href="https://bugs.llvm.org/show_bug.cgi?id=45801">45801</a>
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<th>Summary</th>
<td>The using declaration doesn't work for parent class' constructors.
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>10.0
</td>
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<th>Hardware</th>
<td>All
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>C++14
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
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<th>Reporter</th>
<td>312988336@qq.com
</td>
</tr>
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<th>CC</th>
<td>blitzrakete@gmail.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<p>
<div>
<pre>The following code works in GCC 9.3 and MSVC v19.24, but fails in Clang 10.0.0
(adding the typename keyword resolves that issue, but Clang has other problems
that GCC does not).
==================
template<typename>
struct A
{
int n;
A(bool)
{}
};
template<typename>
struct B
{
struct C : A<B>
{
using Base = A<B>;
using A<B>::A; // ok
using Base::n; // ok
// error: dependent using declaration resolved to type without
'typename'
using Base::A;
};
C get() const
{
return C(true);
}
};
int main()
{
auto b = B<int>();
b.get();
}</pre>
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