Re: [Boost-users] [variant] make_recursive_variant and std::map

From: Richard Crossley (rdc_at_[hidden])
Date: 2006-12-19 16:32:10

No joy.

With your code I get exactly the same error. This is VC8 with SP1 installed
and using cvs head.

Trying with Intel 9.1 I see the same problem.

C:\Program Files\Microsoft Visual Studio 8\VC\include\utility(54): error:
incomplete type is not allowed
          _Ty2 second;	// the second stored value
               ^
          detected during:
            instantiation of class "std::pair<_Ty1, _Ty2> [with _Ty1=const
float, _Ty2=boost::recursive_variant_]" at line 258 of "C:\Program
Files\Microsoft Visual Studio 8\VC\include\xtree"
            instantiation of "std::_Tree<_Traits>::_Ctptr
std::_Tree<_Traits>::const_iterator::operator->() const [with
_Traits=std::_Tmap_traits<float, element, std::less<float>,
std::allocator<std::pair<const float, element>>, false>]"

Regards,

Richard.

>-----Original Message-----
>From: boost-users-bounces_at_[hidden] [mailto:boost-users-
>bounces_at_[hidden]] On Behalf Of Caleb Epstein
>Sent: 18 December 2006 15:14
>To: boost-users_at_[hidden]
>Subject: Re: [Boost-users] [variant] make_recursive_variant and std::map
>
>On 12/15/06, Richard Crossley <rdc_at_[hidden]> wrote:
>
>> boost::make_recursive_variant<
>>         int,std::map<float,boost::recursive_variant_>
>> >::type var;
>>
>> Is there a way to do this?
>
>Sure.  You've got it.
>
>> VC8.1 complains with:
>> utility(54) : error C2079: 'std::pair<_Ty1,_Ty2>::second' uses
>> undefined struct 'boost::recursive_variant_'
>>         with
>>         [
>>             _Ty1=const float,
>>             _Ty2=boost::recursive_variant_
>>         ]
>
>What does your code look like that generates this error?  Its not coming
>from the make_recursive_variant typedef, but some usage of it.
>You probably need to introduce one or two other typedefs that don't
>reference the "recursive_variant_" type.  See the attached test program
>that creates a recursive variant like yours, populates it, and prints
>the contents using a static visitor.
>
>--
>Caleb Epstein