Re: [boost] [serialization] fast array serialization (10x speedup)

From: Peter Dimov (pdimov_at_[hidden])
Date: 2005-11-24 10:50:52

Robert Ramey wrote:
>> Perhaps Robert can state for himself whether he considers
>>
>> http://lists.boost.org/Archives/boost/2005/11/97058.php
>>
>> unacceptable, and why.
>
> This link doesn't work for me.

"""
Looking at collections_save_imp.hpp:

template<class Archive, class Container>
inline void save_collection(Archive & ar, const Container &s)
{
    // record number of elements
    unsigned int count = s.size();
    ar << make_nvp("count", const_cast<const unsigned int &>(count));
    BOOST_DEDUCED_TYPENAME Container::const_iterator it = s.begin();
    while(count-- > 0){
        //if(0 == (ar.get_flags() & boost::archive::no_object_creation))
                // note borland emits a no-op without the explicit namespace
                boost::serialization::save_construct_data_adl(ar, &(*it),
0U);
        ar << boost::serialization::make_nvp("item", *it++);
    }
}

all that needs to be done is:

template<class Archive, class It>
inline void save_sequence(Archive & ar, It it, unsigned count)
{
    while(count-- > 0){
        //if(0 == (ar.get_flags() & boost::archive::no_object_creation))
                // note borland emits a no-op without the explicit namespace
                boost::serialization::save_construct_data_adl(ar, &(*it),
0U);
        ar << boost::serialization::make_nvp("item", *it++);
    }
}

template<class Archive, class Container>
inline void save_collection(Archive & ar, const Container &s)
{
    // record number of elements
    unsigned int count = s.size();
    ar << make_nvp("count", const_cast<const unsigned int &>(count));
    save_sequence( ar, s.begin(), count );
}

unless I'm missing something fundamental.

"""