Hi Jim
Thank you for the answer. When I tried this solution
i.e. .def("GetHeading",&GetHeading)
error: ‘GetHeading’ was not declared in this scope
I get the above error.
Stating the obvious the error says function was not described in the
scope. Seems a bit nasty business is it so that I would have to write a get
function in someway in to public domain to get the function wrapped in to
boost?
Kind Regards
KV
On Thu, Jul 17, 2014 at 3:12 PM, Jim Bosch <[email protected]> wrote:
> The problem here is actually a C++ issue, not a Boost.Python one. Friend
> functions aren't considered to be part of the scope of the class that
> they're friends with, so when referring to them, just use e.g.
> "&GetHeading", not "&Turtle::GetHeading".
>
> Jim
>
>
> On Wed, Jul 16, 2014 at 7:52 AM, Kv Gopalkrishnan <
> [email protected]> wrote:
>
>> I want to expose a C++ friend functions to python using Python boost.
>> class Turtle{
>> friend const PV& GetHeading(const Turtle& t);
>> friend const PV& GetLeft(const Turtle& t);
>> friend const P& GetPoint(const Turtle& t);
>> friend void SetPoint(Turtle& t, const P& p);
>> public:
>>
>> ...
>>
>> private:
>> PV h;
>> PV l;
>>
>> };
>>
>>
>> Here I have wrapped the classes PV and P so no problem there. I tried to
>> wrap the friend functions like regular functions. Like
>>
>> BOOST_PYTHON_MODULE(TurtleWrapper)
>> {
>> class_<Turtle>("Turtle")
>> .def("GetHeading",&Turtle::GetHeading)
>> .def("GetLeft",&Turtle::GetLeft)
>> .add_property("h",&Turtle::GetHeading)
>> .add_property("l",&Turtle::GetLeft);
>> }
>> When i run the code i get error messages.
>>
>> error: ‘GetHeading’ is not a member of ‘Turtle’
>> error: ‘GetLeft’ is not a member of ‘Turtle’
>>
>> This error is seen for add_property and also .def.
>> So I assume that this is not the way to declare a friend function and the
>> documentation of python boost does not seem (or at least I did not see a
>> note about friend functions). Any help is much appreciated.
>>
>>
>>
>> Kind Regards
>> K.V.
>>
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>
>
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--
K.V.
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