Re: [boost] [serialization] failures of test_exported* tests with gcc 4.1 and higher
The situation is that with polymorphic base class, serialization library throws an exception. With non-polymorphic base class, the program succeeds. You are, probably, right that while x.cpp in my previous mail and test_exported.cpp throw the same exception, the cause may be different. I tried x.cpp (with polymorphic base class) with aCC instead of gcc and got: aCC runtime: Uncaught exception of type "boost::archive::archive_exception". At the same time, test_exported succeeds with aCC. I'll try serialization library at rrsd.com when I have a chance. In the meantime, do you have any idea why the program might be throwing exception with 1.35? Thanks, Boris Robert Ramey wrote:
One can't invoke any function of the derived class through a base class pointer unless the base class is polymorphic - that is has at least one virtual function.
Serialization is no different in this regard.
I would not expect the behavior of the program below to change between version.
The error message is the same as those failures in test_export but the cause isn't necessarily the same.
I would be curious of the version 1.36 serialization library at rrsd.com would pass tests with gcc 4.1 and higher.
Robert Ramey
Boris Gubenko wrote:
x.cpp below reproduces failures of test_exported* tests on several platforms using gcc 4.1 and higher. The tests fail with:
terminate called after throwing an instance of 'boost::archive::archive_exception' what(): unregistered void cast
When compiled with macro WORKS defined, i.e. when destructor of the base class is removed, reproducer succeeds. Does it give any clue?
Thanks, Boris
x.cpp ----- #include <fstream> #include <boost/archive/binary_oarchive.hpp>
struct polymorphic_base { template<class Archive> void serialize(Archive&, const unsigned int) {} #ifndef WORKS virtual ~polymorphic_base(){} #endif };
struct polymorphic_derived : polymorphic_base { template<class Archive> void serialize(Archive&, const unsigned int) {} };
int main() { std::ofstream os("x.x"); boost::archive::binary_oarchive oa(os); polymorphic_base *rb = new polymorphic_derived; oa << BOOST_SERIALIZATION_NVP(rb); }
Boris Gubenko wrote:
The situation is that with polymorphic base class, serialization library throws an exception. With non-polymorphic base class, the program succeeds.
Actually it fails in all cases. If the base is polymorphic, its failing because the derived class isn't registered or exported. This is dectected at runtime and an exception is thrown. If the base isn't polymorphic, then the instance is "sliced" and ONLY the base class information is saved. Your example doesn't have any data so this is not detected in this case. That is - it seems to work but will fail if you add data to the derived class. Robert Ramey
You are, probably, right that while x.cpp in my previous mail and test_exported.cpp throw the same exception, the cause may be different. I tried x.cpp (with polymorphic base class) with aCC instead of gcc and got:
aCC runtime: Uncaught exception of type "boost::archive::archive_exception".
At the same time, test_exported succeeds with aCC.
I'll try serialization library at rrsd.com when I have a chance. In the meantime, do you have any idea why the program might be throwing exception with 1.35?
Thanks, Boris
Robert Ramey wrote:
One can't invoke any function of the derived class through a base class pointer unless the base class is polymorphic - that is has at least one virtual function.
Serialization is no different in this regard.
I would not expect the behavior of the program below to change between version.
The error message is the same as those failures in test_export but the cause isn't necessarily the same.
I would be curious of the version 1.36 serialization library at rrsd.com would pass tests with gcc 4.1 and higher.
Robert Ramey
Boris Gubenko wrote:
x.cpp below reproduces failures of test_exported* tests on several platforms using gcc 4.1 and higher. The tests fail with:
terminate called after throwing an instance of 'boost::archive::archive_exception' what(): unregistered void cast
When compiled with macro WORKS defined, i.e. when destructor of the base class is removed, reproducer succeeds. Does it give any clue?
Thanks, Boris
x.cpp ----- #include <fstream> #include <boost/archive/binary_oarchive.hpp>
struct polymorphic_base { template<class Archive> void serialize(Archive&, const unsigned int) {} #ifndef WORKS virtual ~polymorphic_base(){} #endif };
struct polymorphic_derived : polymorphic_base { template<class Archive> void serialize(Archive&, const unsigned int) {} };
int main() { std::ofstream os("x.x"); boost::archive::binary_oarchive oa(os); polymorphic_base *rb = new polymorphic_derived; oa << BOOST_SERIALIZATION_NVP(rb); }
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Robert Ramey