David Abrahams <dave <at> boostpro.com> writes:
> Frankly I'm not sure it's possible to use a function object in that way.
> Have you tried simply using the data member pointer without the wrapper?
>
> bp::class_< MyClass >( "MyClass", bp::no_init )
> .add_property( "field", &MyClass::field )
>
> ??
Whole point was that the above is not what I want I want the property to have
translated value.
I found one solution to my problem.
template<typename T>
bp::object
make_getter( MyClass T::* mem )
{
// Unfortunately we have to resort to using function from details,
// since public interface is lacking
return bp::detail::make_function_aux( Getter<T>( mem ),
bp::default_call_policies(),
boost::mpl::vector<bp::object,T>() );
}
and this seems to work fine. Ideally get_signature should be updated to work
with function objects properly. I am fine with extra typedefs I might be
required to make. Also make_function can use named template parameters in most
generic form.
similar way I was able to create setters:
template<typename T>
struct Setter {
explicit Setter( MyClass T::* mem ) : m_member( mem ) {}
void operator()( T const& obj, bp::object const& val ) const
{
obj.*m_member = /* reverse conversion here */;
}
MyClass T::* m_member;
};
template<typename T>
bp::object
make_setter( MyClass T::* mem )
{
// Unfortunately we have to resort to using function from details,
// since public interface is lacking
return bp::detail::make_function_aux( Setter<T>( mem ),
bp::default_call_policies(),
boost::mpl::vector<void,T,bp::object
const&>() );
}
And use it like this:
bp::class_< A >( "A", bp::no_init )
.add_property( "fld", make_getter( &A::fld ), make_setter( &A::fld ) )
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