[Serialization]

[Dylan Klomparens]

Hello, I have 2 questions regarding the Serialization library:

=========================

I have a function that I am using to load a serialized class, called "Configuration". A particular line in the function produces a warning message. Should I be worried about this warning?

The function is below, with a comment denoting the warning-producing line.

void Configuration::Save(const string& Name)
{
    ofstream Out(Name.c_str());
    if(Out.fail())
        throw runtime_error("Error: unable to save configuration file.");
    boost::archive::text_oarchive Archiver(Out);
    Archiver << *this; // This line produces the warning.
}

The warning is:
C4308: negative integral constant converted to unsigned type ... error is from file: \boost\mpl\print.hpp line: 51

=========================

In a separate question, I'm wondering why this code compiles:
template<class Archive> void save(Archive& ar, const boost::asio::ip::udp::endpoint& endpoint, unsigned int version)
{
    unsigned short Port = endpoint.port();
    ar << endpoint.address().to_string();
    ar << Port;
}

But this code does not compile:
template<class Archive> void save(Archive& ar, const boost::asio::ip::udp::endpoint& endpoint, unsigned int version)
{
    ar << endpoint.address().to_string();
    ar << endpoint.port();
}

The only difference is endpoint.port() is stored in a seperate unsigned short.

=========================

Any help is much appreciated!

-- Dylan

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[Robert Ramey]

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"Dylan Klomparens" <dylan.klomparens@...> wrote in message news:2eeaa3230911051501u5030ba22se930f6961d438bcd@......

Hello, I have 2 questions regarding the Serialization library:

=========================

I have a function that I am using to load a serialized class, called "Configuration". A particular line in the function produces a warning message. Should I be worried about this warning?

 

yes

The function is below, with a comment denoting the warning-producing line.

void Configuration::Save(const string& Name)
{
    ofstream Out(Name.c_str());
    if(Out.fail())
        throw runtime_error("Error: unable to save configuration file.");
    boost::archive::text_oarchive Archiver(Out);
    Archiver << *this; // This line produces the warning.
}

This is an error produced by the library.  Look at the "error stack" (one above the error) to

see the comments in the code which trip this warnning.

BTW - people often want to "ar << *this or ar << this" and it almost without exception

a misunderstanding about how the library should be used. Look at the examples and

tests.

The warning is:
C4308: negative integral constant converted to unsigned type ... error is from file: \boost\mpl\print.hpp line: 51

=========================

In a separate question, I'm wondering why this code compiles:
template<class Archive> void save(Archive& ar, const boost::asio::ip::udp::endpoint& endpoint, unsigned int version)
{
    unsigned short Port = endpoint.port();
    ar << endpoint.address().to_string();
    ar << Port;
}

But this code does not compile:
template<class Archive> void save(Archive& ar, const boost::asio::ip::udp::endpoint& endpoint, unsigned int version)
{
    ar << endpoint.address().to_string();
    ar << endpoint.port();
}

The only difference is endpoint.port() is stored in a seperate unsigned short.

 

AND this is an rvalue.  That is, its value is on the stack and it's address cannot be used.

Hence it cannot be serialized without special considerations.

I don't know why the first one doesn't fail to compile.  It's probably a string

which is a primitive so no tracking is done so it's OK to do it.

Robert Ramey

=========================

Any help is much appreciated!

-- Dylan

---

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_______________________________________________
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Boost-users@...
http://lists.boost.org/mailman/listinfo.cgi/boost-users