Re: [boost] Anyone have access to Sun Studio 12 compiler?

Subject: Re: [boost] Anyone have access to Sun Studio 12 compiler?
From: Marshall Clow (mclow.lists_at_[hidden])
Date: 2010-10-23 15:12:37

On Oct 21, 2010, at 9:12 AM, Lars Viklund wrote:
> On Thu, Oct 21, 2010 at 07:49:29AM -0400, David Abrahams wrote:
>> At Wed, 20 Oct 2010 12:08:28 -0700,
>> Marshall Clow wrote:
>>> 
>>> Yeah - it's complaining about a method in boost::array:
>>> 
>>>    // Specific for boost::array: simply returns its elems data member.
>>>    template <typename T, std::size_t N>
>>>    T(&get_c_array(boost::array<T,N>& arg))[N]
>>>    {
>>>        return arg.elems;
>>>    }
>> 
>> My guess is it can't parse the function-returning-reference-to-array
>> syntax.  You can try this instead:
>> 
>>    namespace detail
>>    {
>>        template <typename T, std::size_t N> struct c_array
>>        {
>>            typedef T[N] type;
>>        };
>>    }
>> 
>>    // Specific for boost::array: simply returns its elems data member.
>>    template <typename T, std::size_t N>
>>    typename detail::c_array<T,N>::type& get_c_array(boost::array<T,N>& arg)
>>    {
>>        return arg.elems;
>>    }
> 
> That code, together with the corresponding const variant [1] of the second
> function, makes building --with-math get past the previous trouble spots
> without problems.

Thanks for the suggestion, Dave.

Sadly, on my machine, both gcc 4.2.1 and clang 2.8 reject this code with:

/Marshall/Sources/boost/trunk/boost/array.hpp:367:21: error: expected member name or ';' after declaration specifiers
           typedef T[N] type;
           ~~~~~~~~~^
1 error generated.

--- or ---

../../../boost/array.hpp:367: error: expected unqualified-id before '[' token

This, however, seems to work:

        namespace detail {
       template <typename T, std::size_t N> struct c_array
       {
           typedef T type[N];
       };
        }

I've checked this in as revision #66154 and will watch the tests cycle.

-- Marshall