http://llvm.org/bugs/show_bug.cgi?id=20482
Bug ID: 20482
Summary: [C++11] The template parameter pack of a function
template should be the last template parameter
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: C++11
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
The both sample codes below should cause compilation error but they are
compiled successfully by clang.
==============================================
template<class... T, class... U> void f() { }
==============================================
===========================================
template<class... T, class U> void g() { }
===========================================
According to C++11 standard 14.1 Template parameters [temp.param] paragraph 11,
"A template parameter pack of a function template shall not be followed by
another template parameter unless that template parameter can be deduced from
the parameter-type-list of the function template or has a default argument."
The latest draft is more clarified using the following example.
=======================================================================
// U can be neither deduced from the parameter-type-list nor specified
template<class... T, class... U> void f() { } // error
template<class... T, class U> void g() { } // error
=======================================================================
cf. http://melpon.org/wandbox/permlink/7Xl64RRorrf0L1vR
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