Re: Vector of types

James Kanze <>
Tue, 14 Dec 2010 01:51:07 -0800 (PST)
On Dec 13, 6:06 pm, Andrea Crotti <> wrote:

I tried with a simpler example and it surprisingly works!!

Stream Packet::toStream() const
    Stream res;
    // use the field list to get the stuff out
    for (size_t i=0; i < fields.size(); ++i) {
        std::cout << typeid(*fields[i]).name() << std::endl;
        res += FieldHeader::sizeField(*fields[i]);
    return FieldHeader::typeField(res, type);

For what definition of "works"? You have no control over what
typeid().name() returns. It varies greatly from implementation
to implementation, and may change from one version to the next
within a given implementation. For all practical purposes,
typeid().name() is useless except for debugging messages (and
in some implementations, like g++, it's useless for that as

The usual way to handle serialization is to hand write the
serialization of the fundamental types, and then use a code
generator for the rest: define a simple "language" to specify
the serializable data types, and write a simple program (often
in a scripting language like AWK) to "compile" it to C++, with
the necessary functions.

James Kanze

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