[Boost-users] [Serialization] Load an object from the base pointer

Subject: [Boost-users] [Serialization] Load an object from the base pointer
From: Ryan Fowler (Ryan.Fowler_at_[hidden])
Date: 2009-03-04 10:30:07

Hi,

 

How can I read in a from a stream when I don't know the exact type I
will be getting?  All objects I receive will derive from the same base
class, but I won't know when I receive the stream what the derived type
will be and therefore I can't create it in advance (like in the docs).

 

class base

{

...

}

 

class derived1 : public base

{

...

}

 

class derived2 : public base

{

...

}

 

int main()

{

    // Get a stream from somewhere

    boost::archive::binary_iarchive ia( instream );

 

    base b0;

    derived1 d1;

    derived2 d2;

    is >> // derived1 or derived2???

}

 

Ryan Fowler
Software Engineer

Thomson Reuters 

Phone: [phone]

ryan.fowler_at_[hidden]
thomsonreuters.com

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