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#pragma once
/// @file
/// Generic VTK class + smart pointer casters.
/// Based on: https://gitlab.kitware.com/cmb/smtk/blob/9bf5b4f9/smtk/extension/vtk/pybind11/PybindVTKTypeCaster.h
/// which uses the SMTK License Version 1.0 (similar to BSD 3-Clause?).
/// @authors Kitware, Inc; Eric Cousineau
#include <type_traits>
#include <pybind11/cast.h>
#include <pybind11/pybind11.h>
#include <vtkObjectBase.h>
#include <vtkPythonUtil.h>
#include <vtkSmartPointer.h>
namespace pybind11 {
namespace detail {
/// Direct access to VTK class.
template <typename Class>
struct type_caster<
Class,
enable_if_t<std::is_base_of<vtkObjectBase, Class>::value>
> {
private:
Class* value;
public:
static constexpr auto name = _<Class>();
static handle cast(
const Class *src, return_value_policy policy, handle parent) {
if (!src)
return none().release();
if (policy == return_value_policy::take_ownership) {
throw cast_error(
"vtk_pybind: `take_ownership` does not make sense in VTK?");
}
if (policy == return_value_policy::copy) {
throw cast_error(
"vtk_pybind: `copy` does not make sense in VTK?");
}
return vtkPythonUtil::GetObjectFromPointer(const_cast<Class*>(src));
}
static handle cast(
const Class& src, return_value_policy policy, handle parent) {
return cast(&src, policy, parent);
}
operator Class*() { return value; }
operator Class&() { return *value; }
// Does this even make sense in VTK?
operator Class&&() && { return std::move(*value); }
template <typename T_>
using cast_op_type = pybind11::detail::movable_cast_op_type<T_>;
bool load(handle src, bool /* convert */) {
value = dynamic_cast<Class*>(
vtkPythonUtil::GetPointerFromObject(
src.ptr(), type_id<Class>().c_str()));
return value != nullptr;
}
};
/// VTK Pointer-like object - may be non-copyable.
template <typename Ptr>
struct vtk_ptr_cast_only {
protected:
using Class = intrinsic_t<decltype(*std::declval<Ptr>())>;
using value_caster_type = type_caster<Class>;
public:
static constexpr auto name = _<Class>();
static handle cast(
const Ptr& ptr, return_value_policy policy, handle parent) {
return value_caster_type::cast(*ptr, policy, parent);;
}
};
/// VTK Pointer-like object - copyable / movable.
template <typename Ptr>
struct vtk_ptr_cast_and_load : public vtk_ptr_cast_only<Ptr> {
private:
Ptr value;
// N.B. Can't easily access base versions...
using Class = intrinsic_t<decltype(*std::declval<Ptr>())>;
using value_caster_type = type_caster<Class>;
public:
operator Ptr&() { return value; }
// Does this even make sense in VTK?
operator Ptr&&() && { return std::move(value); }
template <typename T_>
using cast_op_type = pybind11::detail::movable_cast_op_type<T_>;
bool load(handle src, bool convert) {
value_caster_type value_caster;
if (!value_caster.load(src, convert)) {
return false;
}
value = Ptr(value_caster.operator Class*());
return true;
}
};
template <typename Class>
struct type_caster<vtkSmartPointer<Class>>
: public vtk_ptr_cast_and_load<vtkSmartPointer<Class>> {};
template <typename Class>
struct type_caster<vtkNew<Class>>
: public vtk_ptr_cast_only<vtkNew<Class>> {};
} // namespace detail
} // namespace pybind11
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