Re: [Boost-users] How to expose self defined type in boost.python

From: Huang You Gong (huangyougong_at_[hidden])
Date: 2008-01-14 08:22:46

I checked the maillist history, and there are guys who have the same
question with me.

class btQuadWord
{
        protected:
                btScalar m_x;
                btScalar m_y;
                btScalar m_z;
                btScalar m_unusedW;

        public:
                SIMD_FORCE_INLINE const btScalar& getX() const { return m_x;
}
};

 class_<btQuadWord>("btQuadWord")
        .def("getX", &btQuadWord::getX)
        ;
see here: http://lists.boost.org/boost-users/2007/05/27828.php

the same question is, when the function return a value which type is not a
basic type ( even a pointer ), there will be errors.

On 1/14/08, Huang You Gong <huangyougong_at_[hidden]> wrote:
>
> Hi,
>
> I try to use boost.python to invoke C++ library in Python, so I need to
> expose types and classes.
> Here is the c++ head file:
>
>  *typedef int XTYPE;*
> *class XCLASS*
> *{*
> *public:*
> *        XTYPE getvalue( void ){ return XTYPE( 3 ); }*
> *};*
>
> So I write exposing code in BOOST_PYTHON_MODULE like this:
>
>  *BOOST_PYTHON_MODULE( x )*
> *{*
> *        class_< XCLASS >( "XCLASS" )*
> *                .def( "getvalue", &XCLASS::getvalue, return_value_policy<
> copy_non_const_reference >() )*
> *        ;*
> *}*
>
> but there is compiling error as using of undefined type.
> what shall I do to make the type XTYPE known by boost.python?
> Thanks in advance!
>
> --
> Huang You Gong
>

-- 
Huang You Gong