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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Template deduction fails with defaulted argument that's an index_sequence"
href="https://bugs.llvm.org/show_bug.cgi?id=42757">42757</a>
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<th>Summary</th>
<td>Template deduction fails with defaulted argument that's an index_sequence
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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>PC
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<th>OS</th>
<td>Windows NT
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>enhancement
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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>barry.revzin@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>Reduced from StackOverflow (<a href="https://stackoverflow.com/q/57206006/2069064">https://stackoverflow.com/q/57206006/2069064</a>):
#include <utility>
#include <cstdint>
template <std::size_t S, class=std::make_index_sequence<S>>
struct FooList;
template <std::size_t S, std::size_t... Idxs>
struct FooList<S, std::integer_sequence<std::size_t, Idxs...>> { };
template <std::size_t S>
void foobar(FooList<S>) { }
void test() {
foobar(FooList<5>{});
}
This fails to compile on clang, the candidate is rejected with the note:
candidate template ignored: could not match '__make_integer_seq' against
'integer_sequence'
Even though these are the same type. This compiles on gcc.</pre>
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