Re: [boost] [mpl] Using apply with gcc error

Subject: Re: [boost] [mpl] Using apply with gcc error
From: Edward Diener (eldiener_at_[hidden])
Date: 2011-02-03 18:34:05

On 2/3/2011 5:58 PM, Jeffrey Lee Hellrung, Jr. wrote:
> On 2/3/2011 2:42 PM, Edward Diener wrote:
>> Compiling this code with gcc:
>>
>> #include <boost/config.hpp>
>> #include <boost/mpl/apply.hpp>
>>
>> template
>> <
>> class MF,
>> class T
>> >
>> struct myMF :
>> boost::mpl::apply<MF,T>
>> {
>> BOOST_STATIC_CONSTANT(bool,value=type::value);
>
> AFAIK, since type resides in the base class, which is a dependent type,
> the compiler won't look in the base class for type; it's looking in
> namespace scope and there's no type at namespace scope. So you either
> need a using declaration or explicit qualification. (Some versions of
> MSVC, at least, happily but incorrectly accept the above code.)
>
> Sorry, no references handy :(

You are correct. I should have realized this, but the MPL book 
suggestions metafunction forwarding so I used it.