Re: [Boost-users] [python] Defining a variable

Subject: Re: [Boost-users] [python] Defining a variable
From: Neal Becker (ndbecker2_at_[hidden])
Date: 2008-09-24 20:08:22

Robert Dailey wrote:

> On Wed, Sep 24, 2008 at 5:38 PM, Robert Dailey <rcdailey_at_[hidden]> wrote:
> 
>> Hi,
>>
>> I'm embedding python through Boost.Python. Before I "import" or "exec" a
>> specific PY file, I want to set a global variable in that script that the
>> user will be able to access when the script is finally executed or
>> imported. How would I do this?
>>
> 
> I've come up with the following code:
> 
>     boost::python::object GetNamespace( char const* mod )
>     {
>         using namespace boost::python;
>         object theModule = import( mod );
>         return theModule.attr( "__dict__" );
>     }
> 
>     template< typename t_type >
>     bool AddGlobal( std::string const& name, t_type const& global )
>     {
>         using namespace boost::python;
>         object main = GetNamespace( "__main__" );
>         main[name] = global;
>         return true;
>     }
> 
> However, the above results in the following exception if I pass a pointer
> type to the 'global' parameter in my AddGlobal function. Note that the
> pointer type is that of a user defined class, like Interface*:
> 
> *First-chance exception at 0x7d4e2366 in Crusades_Debug.exe: Microsoft C++
> exception: boost::python::error_already_set at memory location
> 0x0012ed44..*
> 
> Anyone know why this is happening? I haven't exposed the class in question
> (class Interface) through class_(). Could this be the problem?
 
How about:
scope().attr("something") = whatever;