http://llvm.org/bugs/show_bug.cgi?id=20398
Bug ID: 20398
Summary: clang C++11 wrong number of template parameters using
aliases with template parameter pack
Product: clang
Version: 3.4
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
Bug appears when passing template parameter packs to aliases. As a result, the
alias does not accept any parameters without any warning from the compiler.
Minimal test-case:
==================
#include <string>
#include <iostream>
template <template <class...> class TT, class T, class... Rest>
using Tail = TT<Rest...>;
template <class... Ts>
struct Bar
{
static constexpr uint size = sizeof...(Ts);
};
template <class... Ts>
struct Foo
{
static constexpr uint size = sizeof...(Ts);
using TailBar = Tail<Bar, Ts...>;
static constexpr uint bar_size = TailBar::size;
};
int main(int argc, char *argv[])
{
using ZZZ = Foo<int, int, int>;
std::cout << "size:" << ZZZ::size << " bar_size:" << ZZZ::bar_size <<
std::endl;
}
==================
Expected output: "size:3 bar_size:2"
Resulting output: "size:3 bar_size:0"
This bug does not occur if we refuse to use an alias "Tail":
...
template <template <class...> class TT, class T, class... Rest>
struct Tail
{
using type = TT<Rest...>;
};
...
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