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nb_array.h
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nb_array.h
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#pragma once
#include <nanobind/nanobind.h>
NAMESPACE_BEGIN(NB_NAMESPACE)
NAMESPACE_BEGIN(detail)
template <typename Array, typename Entry, size_t Size> struct array_caster {
NB_TYPE_CASTER(Array, const_name(NB_TYPING_LIST "[") +
make_caster<Entry>::Name + const_name("]"));
using Caster = make_caster<Entry>;
bool from_python(handle src, uint8_t flags, cleanup_list *cleanup) noexcept {
PyObject *temp;
/* Will initialize 'temp' (NULL in the case of a failure.) */
PyObject **o = seq_get_with_size(src.ptr(), Size, &temp);
Caster caster;
bool success = o != nullptr;
if (is_base_caster_v<Caster> && !std::is_pointer_v<Entry>)
flags |= (uint8_t) cast_flags::none_disallowed;
if (success) {
for (size_t i = 0; i < Size; ++i) {
if (!caster.from_python(o[i], flags, cleanup)) {
success = false;
break;
}
value[i] = caster.operator cast_t<Entry>();
}
Py_XDECREF(temp);
}
return success;
}
template <typename T>
static handle from_cpp(T &&src, rv_policy policy, cleanup_list *cleanup) {
object ret = steal(PyList_New(Size));
if (ret.is_valid()) {
Py_ssize_t index = 0;
for (auto &value : src) {
handle h = Caster::from_cpp(forward_like<T>(value), policy, cleanup);
if (!h.is_valid()) {
ret.reset();
break;
}
NB_LIST_SET_ITEM(ret.ptr(), index++, h.ptr());
}
}
return ret.release();
}
};
NAMESPACE_END(detail)
NAMESPACE_END(NB_NAMESPACE)