http://llvm.org/bugs/show_bug.cgi?id=21446
Bug ID: 21446
Summary: Trailing decltype in variadic function with explicitly
specified template parameters fails
Product: clang
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: C++11
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
This code fails to compile:
template<typename...Us>
void boinc(Us...us)
{}
template<typename ... Us>
auto foo(Us...us) -> decltype(boinc(((Us)us)...))
{
}
int main()
{
foo<int, int, int>(0,0,0);
}
The error I get is:
test.cpp:13:5: error: no matching function for call to 'foo'
foo<int, int, int>(0,0,0);
^~~~~~~~~~~~~~~~~~
test.cpp:7:6: note: candidate template ignored: substitution failure
[with Us = <int, int, int>]: pack expansion contains parameter packs 'Us'
and 'us' that have different lengths (3 vs. 4)
auto foo(Us...us) -> decltype(boinc(((Us)us)...))
^ ~~~
1 error generated.
This is obviously bogus.
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