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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