PyBind11 Template Class of Many Types

Question

I\'d like to use PyBind11 to wrap a specialized array class. However, the array is available in many flavours (one per each plain-old-datatype). The code looks like this:

Answer 1

You can avoid using macros and instead go with a templated declaration function:

template<typename T>
void declare_array(py::module &m, std::string &typestr) {
    using Class = Array2D<T>;
    std::string pyclass_name = std::string("Array2D") + typestr;
    py::class_<Class>(m, pyclass_name.c_str(), py::buffer_protocol(), py::dynamic_attr())
    .def(py::init<>())
    .def(py::init<Class::xy_t, Class::xy_t, T>())
    .def("size",      &Class::size)
    .def("width",     &Class::width)
    .def("height",    &Class::height);
}

And then call it multiple times:

declare_array<float>(m, "float");
declare_array<int>(m, "int");
...