Re: [boost] [mpl] Strange error using boost::mpl::eval_if

Subject: Re: [boost] [mpl] Strange error using boost::mpl::eval_if
From: Steven Watanabe (watanabesj_at_[hidden])
Date: 2012-11-11 21:21:09

AMDG

On 11/11/2012 06:13 PM, Edward Diener wrote:
> No doubt I have had some sort of C++ brain blockage but the following
> code using boost::mpl::eval_if gives an error and I cannot see how this
> would be. This is a simplified case of a more serious problem.
> 
> ---------------------------------------------------------------
> 
> <snip>
> 
> template<class T1,class T2,class T3,class T4>
> struct DDD :
>   boost::mpl::eval_if
>     <
>     boost::mpl::false_,
>     BBB<T1>,
>     AAA<int,int>
>     >
>   {
>   };
> 
> <snip>
> 
> int main()
>   {
>   bool result = EEE<int,int>::value;
>   return(result ? 1 : 0);
>   }
> 
> -----------------------------------------------------------------------
> 
> Compiling with gcc 4.6.0 in MingW under Windows I get:
> 
> test_has_mem_fun.cpp: In function 'int main()':
> test_has_mem_fun.cpp:50:17: error: 'value' is not a member of 'EEE<int,
> int>'
> 
> <snip>
> 
> -----------------------------------------------------------------------
> 
> I must be overlooking something obvious but I cannot see it. Any help
> showing me what is wrong would be appreciated.
> 

I think you're missing the ::type after eval_if.

In Christ,
Steven Watanabe