OCP_specific.inc

#pragma once
#include <Standard_Handle.hxx>
#include <type_traits>
#include <memory>
#include <fmt/format.h>

namespace py = pybind11;

PYBIND11_DECLARE_HOLDER_TYPE(T, opencascade::handle<T>, true);

using opencascade::handle;

template <typename CppException>
void register_occ_exception(py::handle scope,
                        const char *name){

    py::register_exception<CppException>(scope, name);
};


template <typename T, typename Ptr>
inline void register_default_constructor(py::module m, const char* name){

    if constexpr (std::is_constructible<T>::value){
        static_cast<py::class_<T ,Ptr>>(m.attr(name))
            .def(py::init([]() { return new T; }));
    }

};

template <typename T>
inline void copy_if_assignable(T& t1, T& t2){

    if constexpr (std::is_assignable<T, T>::value){
        t1 = t2;
    }
    else
    {
        throw py::type_error("Cannot assign, function wrapper not working properly.");
    }

};

template <typename T> inline opencascade::handle<T> cast_pyobject(const py::object &arg){
  if(py::isinstance(arg, py::type::of<T>()))
      return opencascade::handle(py::cast<T*>(arg));
  else
      throw py::value_error(fmt::format("Cannot convert the argument to the required type {}", typeid(T).name()));
};

template<typename T, template<typename> typename Deleter = std::default_delete>
struct shared_ptr : public std::shared_ptr<T>{
    explicit shared_ptr(T* t = nullptr) : std::shared_ptr<T>(t, Deleter<T>()) {};
    void reset(T* t = nullptr) { std::shared_ptr<T>::reset(t, Deleter<T>());  };
};

template<typename T> struct nodelete{
    void operator()(T* p) const {};
};

template<typename T> using shared_ptr_nodelete = shared_ptr<T,nodelete>;

PYBIND11_DECLARE_HOLDER_TYPE(T, shared_ptr<T>);
PYBIND11_DECLARE_HOLDER_TYPE(T, shared_ptr_nodelete<T>);

#include "pystreambuf.h"