Re: Serialization

From:
Andrea Crotti <andrea.crotti.0@gmail.com>
Newsgroups:
comp.lang.c++
Date:
Thu, 04 Nov 2010 19:08:04 +0100
Message-ID:
<m1pqulj723.fsf@ip1-201.halifax.rwth-aachen.de>
Leigh Johnston <leigh@i42.co.uk> writes:

Why use templates?

class Serializable
{
public:
     Serializable() {}
     virtual Stream toStream() = 0;
     // used to parse the given stream and create the object
     virtual void parseStream(Stream&) = 0;
};

class PadNodeID : public Serializable
{
     PadNodeID(Stream& aStream) { parseStream(aStream); }
     virtual Stream toStream() { ... }
     virtual void parseStream(const Stream&) { ... }
};

int main()
{
     ...
     Stream st;
     PadNodeID node(st);
}

/Leigh


well actually only because parseStream should be
--8<---------------cut here---------------start------------->8---
virtual T parseStream(const Stream&)
--8<---------------cut here---------------end--------------->8---
where T is the generic type.
Unless I have a way to write the type of the current object directly I
doin't see how else I can do...

About the other question I'm still stuck, rephrasing:
is there a way to have an abstract function which MUST be implemented as
static in every subclass??

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