Re: [Boost-users] Re: Guide to using serialization macro BOOST_CLASS_EXPORT

From: Jim Lear (jim.lear_at_[hidden])
Date: 2005-01-07 15:28:50

Gee.  I didn't know you subscribed to the Boost list.  I guess you saw my
"I'm a newbie and can't find my ass" posting a while back.

Bill Lear wrote:
> On Friday, January 7, 2005 at 10:58:13 (-0800) Robert Ramey writes:
> > ...
> > The whole concept behind BOOST_CLASS_EXPORT has been problematic for me for
> > a couple of reasons.  As a result, the confusion you cite is a real one.
> >   
>
> I settled on the following that a friend suggested, which seems to
> work.
>
> In my serialization/util.h file, I have the following:
>
>   template <class T>
>   void save(const T* t, const std::string& filename) { ... }
>
>   template <class T>
>   T* load(const std::string& filename) { ... }
>
> at the bottom of this file, I have the following:
>
>   namespace dummy { struct bogus { static int bogus_method(); }; }
>
>   // force linking with util.cc
>   static int bogus_variable = dummy::bogus::bogus_method();
>
> in serialization/util.cc, I have:
>
>   #include <serialization/util.h>
>
>   // expensive include which we wish to relegate to one one source file.
>   #include <AllDerived.h>
>
>   // the trigger method that forces others to link with this module
>   int dummy::bogus::bogus_method() { return 0;}
>
> The AllDerived.h file has includes for all my headers and all the
> BOOST_CLASS_EXPORT macros.
>
> In my application code, I do this:
>
>   #include <Base.h>
>   #include <serialization/util.h>
>
> and it all works flawlessly.  I am spared from including the headers
> for my derived classes, and the accompanying export macros.  The save
> and load routines work as expected.
>
>
> Bill
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> Boost-users mailing list
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-- 
Jim Lear

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