[C++-sig] Re: Type Exception of type Argument Error
Brian Hall
bhall at gamers-fix.com
Sun Jul 11 22:36:44 CEST 2004
Here is a simple project that shows the problem...
There is cPythonScriptedAction class which is a wrapper for the
cScriptedAction class which is derived from cAction. cAction holds a
reference to a cState. All of the constructors of the various cAction
classes take a reference to a cState object upon construction which they
store.
The python script derives a new type from the exposed cScriptedAction,
obtains the cState reference via the State() accessor, and makes
modifications to the value the state contains.
The output expected is:
State Value: 10
Hello from Python!
State Value 10
State Value 5
State Value 5
The output received is:
State Value: 10
Hello from Python!
State Value 10
State Value 5
State Value 10
This shows the state value on the C++ side isn't changing, and therefore the
python derived action class has its own copy of the state rather that using
the reference.
I hope this helps explain what's going on!
Brian
-----Original Message-----
From: c++-sig-bounces at python.org [mailto:c++-sig-bounces at python.org] On
Behalf Of David Abrahams
Sent: Sunday, July 11, 2004 1:30 PM
To: c++-sig at python.org
Subject: [C++-sig] Re: Type Exception of type Argument Error
"Brian Hall" <bhall at gamers-fix.com> writes:
> Alright, I've modified my code to use the object class to create python
> objects, and all is going well now aside from the object being passed into
> the constructor being copied rather than used as a reference...
?? What constructor ??
>
> How do can I ensure that any constructor parameters are not copied but are
> actually treated as the correct type of constructor parameters?
I'm lost. Can you post a small piece of code that illustrates your
question?
--
Dave Abrahams
Boost Consulting
http://www.boost-consulting.com
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