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From: "rhalbersma at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/54903] New: Auto + static in-class constant initalization not working
Date: Thu, 11 Oct 2012 18:54:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54903

             Bug #: 54903
           Summary: Auto + static in-class constant initalization not
                    working
    Classification: Unclassified
           Product: gcc
           Version: 4.7.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: rhalbersma@gmail.com


template<int N, int D>
struct Modulus
{
        static auto const value = N % D;
};

template<int N>
struct Angle
{
        static auto const value = Modulus<N, 360>::value; // ERROR
        //static int const value = Modulus<N, 360>::value;  // OK
        //static auto const value = N % 360;                // OK

        typedef Angle<value> type;
};

I cannot do static auto const = Modulus<N, 360>::value, with either MinGW gcc
4.7.2 (Nuwen distro) or Ideone (gcc 4.5.1). Instead, I have to either
explicitly denote the type as static int const value = Modulus<N, 360>::value
or I have to use auto with the full modular expression as static auto const
value = N % 360;.

The code appears to be Standard compliant and works on both Visual C++ 2010
Express and Clang 3.1

Link to Stackoverflow: http://stackoverflow.com/q/12834874/819272