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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 - Failure to partially specialize a class when make_index_sequence is involved"
href="https://bugs.llvm.org/show_bug.cgi?id=52586">52586</a>
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<th>Summary</th>
<td>Failure to partially specialize a class when make_index_sequence is involved
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>trunk
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<th>Hardware</th>
<td>All
</td>
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<th>OS</th>
<td>All
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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++
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>vejnar.martin@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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<pre>The following code fails to compile.
#include <utility>
template <typename T, typename Seq>
struct X;
template <typename T>
struct X<T, std::make_index_sequence<sizeof(T)>> {
};
X<char, std::make_index_sequence<1>> x;
// ^^^
// error: implicit instantiation of undefined template
// 'X<char, std::integer_sequence<unsigned long, 0>>
See <a href="https://godbolt.org/z/o8ejrTGKE">https://godbolt.org/z/o8ejrTGKE</a>
Replacing make_index_sequence<1> with the equivalent index_sequence<0> in the
class template definition works around the issue.</pre>
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