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

Subject: Re: [Boost-users] [Serialization] Load an object from the base pointer
From: Robert Ramey (ramey_at_[hidden])
Date: 2009-03-04 12:30:26

This is explained in the documentation and illustrated by the demos and tests.

In fact, you can even build a progam which will be able to de-serialize types included
in DLLS which have yet to be created.

Robert Ramey
  "Ryan Fowler" <Ryan.Fowler_at_[hidden]> wrote in message news:1C50BA0DCB34A24E9C8ABA96570EF18F073F5211_at_LONSMSXM06.emea.ime.reuters.com...
  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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