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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Explicit template instantiation of nested types"
href="https://bugs.llvm.org/show_bug.cgi?id=49133">49133</a>
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<th>Summary</th>
<td>Explicit template instantiation of nested types
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>11.0
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<th>Hardware</th>
<td>PC
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<th>OS</th>
<td>Linux
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>C++11
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>tomaqa@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>Clang does not accept explicit class template instantiation of a nested type.
Minimal example:
template <typename>
struct Tp {
using Alias = Tp;
};
/// All should be valid and equivalent
extern template struct Tp<int>; //< works
extern template struct Tp<int>::Tp; //< fails
extern template struct Tp<int>::Alias::Tp; //< fails
error: explicit instantiation of non-templated type 'Tp<int>'
The inst. of nested types should be standard-compliant as well as the first
one.
Also, the error message is quite confusing.
Works in GCC.
<a href="https://stackoverflow.com/questions/34506356/using-typedef-in-template-instantiation-and-extern-template-declaration/34506955#34506955">https://stackoverflow.com/questions/34506356/using-typedef-in-template-instantiation-and-extern-template-declaration/34506955#34506955</a>
<a href="https://stackoverflow.com/questions/11414817/code-duplication-between-typedefs-and-explicit-instantiations">https://stackoverflow.com/questions/11414817/code-duplication-between-typedefs-and-explicit-instantiations</a></pre>
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