"Dylan Klomparens" wrote in message news:2eeaa3230911051501u5030ba22se930f6961d438bcd@mail.gmail.com...
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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