Ok, thanks for your answer. I will look for the problem somewhere else
then. ;)
On Tuesday, March 27, 2018 at 2:24:38 PM UTC+2, Vylsain wrote:
>
> Hi,
>
> I'm trying to implement polymorphism with protobuf. I want to have several
> levels, each new level extending the previous one.
> I have a crash when calling MutableExtension.
>
> My .proto file looks like :
>
>
> *package aapb;*
>
> *message A*
> *{*
> * optional int32 fooA = 1;*
>
> * extensions 1000 to max;*
> *}*
>
> *message B*
> *{*
> * extend A*
> * {*
>
> *optional B b = 1000;*
>
> * }*
>
> * optional int32 fooB = 1;*
>
> * extensions 1000 to max;*
> *}*
>
> *message C*
> *{*
> * extend B*
>
> * {*
>
> *optional C c = 1000;*
>
> * }*
>
> * optional int32 fooC = 1;*
>
> * extensions 1000 to max;*
> *}*
>
>
>
> On the C++ side, I have the corresponding classes :
>
> *class A*
> *{*
> * virtual void WriteExtensions(aapb::A *pA){}*
> *}*
>
> *class B : public A*
> *{*
> * virtual void WriteExtensions(aapb::A *pA)*
> * {*
> * aapb::B* pB = pA->MutableExtension(aapb::B::b);*
> * pB->fooB = 1;*
> * WriteExtensions(pB);*
> * }*
>
> * virtual void WriteExtensions(aapb::B *pB){}*
> *}*
>
> *class C : public B*
> *{*
> * virtual void WriteExtensions(aapb::B *pB)*
> * {*
> * aapb::C* pC = pB->MutableExtension(aapb::C::c);
> //crash happens here*
> * pC->fooC = 2;*
> * }*
> *}*
>
> Then, in my program I just create shared_ptr<C> and aapb::A objects and
> call C's WriteExtensions method with aapb::A reference as an argument.
> It works as expected in Debug and I retrieve the correct data when reading
> the file.
> But in Release, I have a segfault when writing the file, when it reaches
> the MutableExtension call of the C class.
> To be more precise, the segfault happens on the call of
> *google::protobuf::internal::ExtensionSet::MutableMessage(int,
> unsigned char, google::protobuf::MessageLite const&,
> google::protobuf::FieldDescriptor const*) ()*
>
> I'm struggling to see where the problem is coming from and wanted to make
> sure the protobuf part is correct before I look for other causes.
> So you guys see anything wrong in the way I use this ?
>
> Thanks
>
>
>
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