Dear Boost experts,
I'm serializing (intrusively) a template class Matrix<T> that includes a
double-pointer buffer of data of type T. So my save/load pair looks like
template<class Archive> void save(Archive & ar, const unsigned int
version) const {
ar & row_dim;
ar & col_dim;
for ( size_t i = 0; i < row_dim; i++ )
for ( size_t j = 0; j < col_dim; j++ ) {
ar & value[i][j];
}
}
template<class Archive> void load(Archive & ar, const unsigned int
version) {
size_t rowdim, coldim;
ar & rowdim;
ar & coldim;
resize( rowdim, coldim );
for ( size_t i = 0; i < rowdim; i++ )
for ( size_t j = 0; j < coldim; j++ )
ar & value[i][j];
}
The type of value is T**. The serialization works OK, but I'm getting some
warnings that lead me to suspect that Boost is trying to track the
addresses of the value[i][j] elements, which is not needed, and presumably
a problem for performance.
g++ -c -m64 -O3 -Wall -I../../include
-I/usr/depot/redhatel5_64/boost/1.48.0/include -o
Linux-x86_64/obj/test_Matrix.o test_Matrix.cpp
/usr/depot/redhatel5_64/boost/1.48.0/include/boost/mpl/print.hpp: In
instantiation of
'boost::mpl::print
':
/usr/depot/redhatel5_64/boost/1.48.0/include/boost/serialization/static_warning.hpp:92:
instantiated from 'boost::serialization::static_warning_test'
/usr/depot/redhatel5_64/boost/1.48.0/include/boost/archive/detail/check.hpp:98:
instantiated from 'void boost::archive::detail::check_object_tracking()
[with T = gcore::Matrix<int>]'
/usr/depot/redhatel5_64/boost/1.48.0/include/boost/archive/detail/oserializer.hpp:313:
instantiated from 'static void
boost::archive::detail::save_non_pointer_type<Archive>::invoke(Archive&,
T&) [with T = gcore::Matrix<int>, Archive = boost::archive::text_oarchive]'
/usr/depot/redhatel5_64/boost/1.48.0/include/boost/archive/detail/oserializer.hpp:525:
instantiated from 'void boost::archive::save(Archive&, T&) [with Archive
= boost::archive::text_oarchive, T = gcore::Matrix<int>]'
/usr/depot/redhatel5_64/boost/1.48.0/include/boost/archive/detail/common_oarchive.hpp:69:
instantiated from 'void
boost::archive::detail::common_oarchive<Archive>::save_override(T&, int)
[with T = gcore::Matrix<int>, Archive = boost::archive::text_oarchive]'
/usr/depot/redhatel5_64/boost/1.48.0/include/boost/archive/basic_text_oarchive.hpp:80:
instantiated from 'void
boost::archive::basic_text_oarchive<Archive>::save_override(T&, int) [with
T = gcore::Matrix<int>, Archive = boost::archive::text_oarchive]'
/usr/depot/redhatel5_64/boost/1.48.0/include/boost/archive/detail/interface_oarchive.hpp:63:
instantiated from 'Archive&
boost::archive::detail::interface_oarchive<Archive>::operator<<(T&) [with T
= gcore::Matrix<int>, Archive = boost::archive::text_oarchive]'
test_Matrix.cpp:43: instantiated from here
/usr/depot/redhatel5_64/boost/1.48.0/include/boost/mpl/print.hpp:55:
warning: comparison between signed and unsigned integer expressions
Is my suspicion correct, and how do I change my code to avoid the warnings
(and performance hits, if any)?
Thanks!
Michele
