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List: boost-users
Subject: [Boost-users] serialization: problem with abstract base class
From: "RIVASSEAU Jean Noel" <JN.RIVASSEAU () oberthurcs ! com>
Date: 2006-02-27 13:25:52
Message-ID: 87F60F7FA02FF749AFB02BD9FCAA6B04DA7AA2 () naserv31 ! nanterre ! oberthurcs ! com
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Hello
The following code (attached) demonstrate a problem that I have. I am trying to \
serialize via pointer to base class (MObject) which is abstract. The docs say that a \
compile error will occur when trying to do that. I don't have any compile time errors \
emitted but the build fails at link time (it does not instantiate the save/load code \
for the abstract base class).
The solutions provided in the docs are: write BOOST_IS_ABSTRACT(MObject): I did that \
and nothing changes;
Or
Implement is_abstract for your compiler. I do not understand what this means. Can you \
help me out ?
Currently the only workaround I have is to not make the base class abstract, but I \
would like it to be abstract...
Jean-Noël
[Attachment #5 (text/html)]
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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Hello<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>The following code (attached) demonstrate a problem
that I have. I am trying to serialize via pointer to base class (MObject) which
is abstract. The docs say that a compile error will occur when trying to do
that. I don’t have any compile time errors emitted but the build fails at
link time (it does not instantiate the save/load code for the abstract base
class).<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>The solutions provided in the docs are: write
BOOST_IS_ABSTRACT(MObject): I did that and nothing \
changes;<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>Or<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>Implement is_abstract for your compiler. I do not
understand what this means. Can you help me out ?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>Currently the only workaround I have is to not make
the base class abstract, but I would like it to be \
abstract…<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>Jean-Noël<o:p></o:p></span></font></p>
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</body>
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["abstract_class_problem.zip" (application/x-zip-compressed)]
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