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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Injected base class name not available when CRTP base class is instantiated using a subclass that is itself a template instantiation."
href="https://llvm.org/bugs/show_bug.cgi?id=25483">25483</a>
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<th>Summary</th>
<td>Injected base class name not available when CRTP base class is instantiated using a subclass that is itself a template instantiation.
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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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
</td>
</tr>
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<th>Reporter</th>
<td>paul.ryan.harvey@gmail.com
</td>
</tr>
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<th>CC</th>
<td>dgregor@apple.com, llvm-bugs@lists.llvm.org
</td>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>An injected base class name is not available to be used as a constructor when a
CRTP base class is instantiated using a subclass that is itself a template
instantiation.
The following works as expected:
template <typename>
struct A {};
struct B : public A<B> {
B() : A() {}
};
int main()
{
B b;
}
The following results in: error: member initializer 'A' does not name a
non-static data member or base class
template <typename>
struct A {};
template <typename T>
struct B : public A<B<T>> {
B() : A() {}
};
int main()
{
B<void> b;
}
The following workaround is available:
template <typename T>
struct B : public A<B<T>> {
using A = A<B>;
B() : A() {}
};</pre>
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