[Boost-users] boost::variant compile error

[Georg.K...@lfu.bayern.de]

Hi,

i'd like to build a heterogenous container based on the boost::variant datastructure. My code looks like this:
// forward-Deklarationen:
class fExport FB_Ordered;
class fExport FB_Dictionary;

// Typedefs
typedef boost::variant<int, std::string> keydicttype;
typedef boost::variant<
int, std::string, date, ptime,
boost::recursive_wrapper<FB_Dictionary>,
boost::recursive_wrapper<FB_Ordered>> valuedicttype;
typedef boost::container::map<keydicttype, valuedicttype> basedict;

C:\dev\boost_1_52_0\boost/checked_delete.hpp(32) : error C2027: use of undefined Type "FB_Ordered"

what i want to do is to create a container fb_dictionary which can hold datatypes that are listed in the valuedicttype and which can accept keyvalues of int and string (see above). fb_ordered is another container defined in a diferent header file so i need the forward declarations. Could anybody please give me a hint in the right direction? I am using vs2008.

Thanks for help,
Georg
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[Jeffrey Lee Hellrung, Jr.]

On Thu, Nov 8, 2012 at 11:44 PM, <Georg.K...@lfu.bayern.de> wrote:

Hi,

i'd like to build a heterogenous container based on the boost::variant datastructure. My code looks like this:
// forward-Deklarationen:
class fExport FB_Ordered;
class fExport FB_Dictionary;

What's fExport?
 

// Typedefs
typedef boost::variant<int, std::string> keydicttype;
typedef boost::variant<
        int, std::string, date, ptime,
        boost::recursive_wrapper<FB_Dictionary>,
        boost::recursive_wrapper<FB_Ordered>> valuedicttype;
typedef boost::container::map<keydicttype, valuedicttype> basedict;

C:\dev\boost_1_52_0\boost/checked_delete.hpp(32) : error C2027: use of undefined Type "FB_Ordered"

what i want to do is to create a container fb_dictionary which can hold datatypes that are listed in the valuedicttype and which can accept keyvalues of int and string (see above). fb_ordered is another container defined in a diferent header file so i need the forward declarations. Could anybody please give me a hint in the right direction?  I am using vs2008.

A full, expected-to-compile example is always helpful. But the errors I'm getting with the above typedefs seem more related to the lack of this fExport keyword you're using. If I remove the fExport stuff then all the typedefs compile fine, and I don't get the undefined type error until I try to instantiate basedict (obviously; FB_Ordered and FB_Dictionary need to be defined by then).

- Jeff

[Steven Watanabe]

AMDG

On 11/08/2012 11:44 PM, Georg.K...@lfu.bayern.de wrote:
> i'd like to build a heterogenous container based on the boost::variant datastructure. My code looks like this:
> // forward-Deklarationen:
> class fExport FB_Ordered;
> class fExport FB_Dictionary;
>
> // Typedefs
> typedef boost::variant<int, std::string> keydicttype;
> typedef boost::variant<
> int, std::string, date, ptime,
> boost::recursive_wrapper<FB_Dictionary>,
> boost::recursive_wrapper<FB_Ordered>> valuedicttype;
> typedef boost::container::map<keydicttype, valuedicttype> basedict;
>
> C:\dev\boost_1_52_0\boost/checked_delete.hpp(32) : error C2027: use of undefined Type "FB_Ordered"
>
> what i want to do is to create a container fb_dictionary which can hold datatypes that are listed in the valuedicttype and which can accept keyvalues of int and string (see above). fb_ordered is another container defined in a diferent header file so i need the forward declarations. Could anybody please give me a hint in the right direction? I am using vs2008.
>

FP_Ordered has to be complete at the point where
the destructor of variant is instantiated. The
same thing goes for FB_Dictionary.

In Christ,
Steven Watanabe

[Georg.K...@lfu.bayern.de]

Hi Jeffrey,

 

thanks for your help. The fexport keyword was to decide if i build a dll or another application that is using my class. I removed it since my module will compile to a static library and until now all works fine.

 

greetings,

Georg

---

Von: boost-use...@lists.boost.org [mailto:boost-use...@lists.boost.org] Im Auftrag von Jeffrey Lee Hellrung, Jr.
Gesendet: Freitag, 9. November 2012 15:13
An: boost...@lists.boost.org
Betreff: Re: [Boost-users] boost::variant compile error