Re: [boost] Re: from enumerations to I/O streams

From: Anton Gluck (gluc_at_[hidden])
Date: 2000-10-29 22:56:45

> ifstream as a parameter. If you don't want to intrude on your class'
> interface, you can do something like this:
> 
> struct TextRecordIteratorWrapper : TextRecordIterator
> {
>    TextRecordIteratorWrapper(std::ifstream* s) :
>       TextRecordIterator(*s) {}
> };
> 
> ...
> py::ClassWrapper<TextRecordIteratorWrapper>
> text_record_class(ClusterForPython, "TextRecordIterator");
> text_record_class.def(py::Constructor<std::ifstream*>());
> text_record_class.def(&TextRecordIteratorWrapper::function1, "function1");
> ...

Most of this works, except for the last line (exposing a
TextRecordIterator function, properly renamed of course). This being an
iterator, I tried exposing its HasMore and Next functions. I got this
error:

d:\py_cpp/caller.h(32) : error C2665: 'from_python' : none of the 134
overloads can convert parameter 2 from type 'struct py::Type<class
TextRecordIterator &>'
        d:\py_cpp/functions.h(54) : see reference to function template
instantiation 'struct _object *__cdecl py::Caller<int>::call(int
(__thiscall TextRecordIterator::*)(void),struct _object *,struct _object
*)' being compiled

I suppose the move from TextRecordIteratorWrapper to the underlying
TextRecordIterator causes the problem. Another bug?

Thanks for your help,

Toni