使用boost :: archive和boost :: iostreams来压缩数据

Question

I want to write a serialize function for a class that can optionally compress the data. I would like to use the compression facilities provided in boost::iostreams. Does anyone know how to do this?

struct X
{
    X() {}

    template<class Archive>
    void serialize(Archive & ar, const unsigned int version)
    {
        ar & compression;
        if(compression == 0)
        {
            ar & data;
        }
        else if(compression == 1)
        {
            // use boost::iostream compression
            // facilities to serialize data
        }
    }

    int compression;
    std::vector<int> data;
};

Answer 1

The only way I can see to do that is compress the data first and then use ar.load_binary and ar.save_binary. To compress the data, you could use a filtering_stream with std::ostringstream as sink and an appropriate compression filter.

Any reason you don't want to push the compression down the stack (that is, build your archive over a compressing stream)?