Class generator

[fwilliams]

Let's add support for

npe_class(PythonClassName, cpp::MyClass)

npe_init()
npe_arg(a, dense_f32, dense_f64)
npe_arg(b, npe_matches(a))
npe_begin_code()

return cpp::MyClass(a, b);

npe_end_code()

npe_method(foo)
npe_arg(a, dense_f32, dense_f64)
npe_begin_code()

return npe_self.foo(a);

npe_end_code()

npe_end_class()

This is definitely more overhead in terms of boilerplate than pybind11 since we aren't auto wrapping methods. We could also have an automatic mode that looks like:

• npe_auto init(PythonClassName, cpp::MyClass, arg1, ..., argN)
• npe_auto_method(PythonMethodName, cpp:MyClass::method)