[variant] make_recursive_variant and std::map

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Richard Crossley

15 Dec 2006 15 Dec '06

4:15 p.m.

I would like to be able to use a recursive variant similar to the way it's shown in the documentation but using a std::map instead of std::vector. i.e. boost::make_recursive_variant< int,std::map

...

::type var;

Is there a way to do this? 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_ ] Regards, Richard.

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Caleb Epstein

18 Dec 18 Dec

3:13 p.m.

On 12/15/06, Richard Crossley wrote:

...

boost::make_recursive_variant< int,std::map

...
::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

Richard Crossley

19 Dec 19 Dec

9:32 p.m.

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>, false>]" Regards, Richard.

...

-----Original Message----- From: boost-users-bounces@lists.boost.org [mailto:boost-users- bounces@lists.boost.org] On Behalf Of Caleb Epstein Sent: 18 December 2006 15:14 To: boost-users@lists.boost.org Subject: Re: [Boost-users] [variant] make_recursive_variant and std::map

On 12/15/06, Richard Crossley wrote:

...
boost::make_recursive_variant< int,std::map

...
::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

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Caleb Epstein
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