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From: "ghartshaw at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/58743] New: [C++11] parameter packs not expanded with '...'
Date: Wed, 16 Oct 2013 03:54:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58743

            Bug ID: 58743
           Summary: [C++11] parameter packs not expanded with '...'
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ghartshaw at gmail dot com

Created attachment 31015
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=31015&action=edit
Compiliation error messages.

The following test case gives an "parameter packs not expanded with '...'"
error where it should not:

$ cat error_example.cpp
struct tensor {
    constexpr tensor( int value ) : _value( value ) {}
    template <int... Indices> constexpr int value() const { return _value; }
private:
    int _value;
};

template <typename T> struct printer {
    static int get( T const & tensor ) { return detail<>::get( tensor ); }
private:
    template <int... Indices> struct detail {
        static int get( T const & tensor ) { return tensor.value<Indices...>();
}
    };
};

int main() {
    printer<tensor>::get( tensor<int>(1) );
}
$ g++-4.9 --version
g++-4.9 (GCC) 4.9.0 20131015 (experimental)
$ g++-4.9 -std=c++11 -Wall -Wextra error_example.cpp -save-temps -v
2>output.txt