Re: [Boost-users] boost::serialization - serializing boost::smart_ptrswon't work

From: Sascha Friedmann (sascha.friedmann_at_[hidden])
Date: 2006-08-09 11:10:37

Robert Ramey wrote:
> Sascha Friedmann wrote:
>> Hello,
>> I have a problem with serializing smart_ptrs. I have tried both the
>> boost::scoped_ptr and the boost::shared_ptr but I get always the same
>> error:
>>
>> Boost1-33\include\boost-1_33\boost\archive\detail\oserializer.hpp(566):
>> error C2027: Use of undefined type
>>         "boost::STATIC_ASSERTION_FAILURE<x>" with
>>         [
>>             x=false
>>         ]
>>
> 
>> int main( int argc, char* argv[] )
>>
>> {
>>
> 
> ****
> replace the following
>> Test t;
> 
> with
> 
> const Test t;
> 
> 
>> std::ofstream ofs( "test.txt" );
>>
>> boost::archive::text_oarchive out( ofs );
>>
>> out << t;
>>
>> }
>>
>>
>>
>> I hope someone can help me (google and the documentation couldn't :()
> 
> This is explained in  couple of places:
> 
> a) The code comment at the point where the compile time error occurs gives
> and explanation and points to more information.
> b) The Rationale section of the documentation explains this in detail
> and why this is trapped.
>>
>>
>> Sascha Friedmann 
I understand now the problem, but in my real project I ran again into 
this trap. After rereading the article in the rationale I understand 
fully why it is trapping, but I don't want to set my class to 
track_never because I can't guarantee that it is what I want. And 
const_cast is no solution, too.
So the thing that is left is this construct_from class-wrapper.
But it seems it is only an example an not a part of the 
boost::serialization library.
How do I write my own construct_from wrapper, that can wrap all my 
objects, so that I can still create them non-const on the stack and use 
them and for serializing I'm just creating such a construct_from wrapper 
for an object?
While writing I'm wondering now if I'm not bypassing the system with this..

Sascha Friedmann