https://bugs.llvm.org/show_bug.cgi?id=42757
Bug ID: 42757
Summary: Template deduction fails with defaulted argument
that's an index_sequence
Product: clang
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: C++
Assignee: unassignedclangb...@nondot.org
Reporter: barry.rev...@gmail.com
CC: blitzrak...@gmail.com, dgre...@apple.com,
erik.pilking...@gmail.com, llvm-bugs@lists.llvm.org,
richard-l...@metafoo.co.uk
Reduced from StackOverflow (https://stackoverflow.com/q/57206006/2069064):
#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.
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