I am trying to bind a C++ class but python is reporting there is no
matching signature for two of the methods which are I am trying to bind
using the member function overloads macro.
The class looks like so:
struct path {
path();
path(double line_width);
void move_to(point_t point);
void line_to(point_t point);
void curve_to(std::array<point_t, 3>&& points)
void curve_to(const std::array<point_t, 3>& points);
void fill(context& ctx, bool close = true) const;
void stroke(context& ctx, bool close = true) const;
};
I'm not sure if this is the best way but I have made a thin wrapper
around the class such that the curve_to method can be called with a tuple:
struct path_wrapper : path {
using path::path;
void curve_to(const py::tuple& points)
{
path::curve_to({
py::extract<path::point_t>(points[0]),
py::extract<path::point_t>(points[1]),
py::extract<path::point_t>(points[2]),
});
}
};
The function overloads are being defined as such:
BOOST_PYTHON_MEMBER_FUNCTION_OVERLOADS(
path_fill_overloads, fill, 1, 2
);
BOOST_PYTHON_MEMBER_FUNCTION_OVERLOADS(
path_stroke_overloads, stroke, 1, 2
);
I then bind the class as such:
py::class_<path_wrapper>("Path")
.def(py::init<double>())
.def("move_to", &path::move_to)
.def("line_to", &path::line_to)
.def("curve_to", &path_wrapper::curve_to)
.def("fill", &path::fill, path_fill_overloads())
.def("stroke", &path::stroke, path_stroke_overloads());
I am binding the other classes named throughout this process, but I have
omitted their actual class_ calls from this message.
When I make a call to the methods in python I recieve the following error:
Traceback (most recent call last):
File "/home/james/projects/imgen/patterns/triangles.py", line 46,
in draw
path.stroke(context)
Boost.Python.ArgumentError: Python argument types in
Path.stroke(Path, Context)
did not match C++ signature:
stroke(path {lvalue}, context {lvalue})
stroke(path {lvalue}, context {lvalue}, bool)
I am really confused as the signatures appear to match. I suspect I've
broken the converters with my wrapper class but I am unsure how to fix it.
Thank you.
