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Copying type_caster_generic::cast into type_caster<mpty> as-is (preparation for handling smart pointers).

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This commit is contained in:
Ralf W. Grosse-Kunstleve 2021-01-12 20:01:12 -08:00
parent 4359422d99
commit ee6d15647d
1 changed files with 94 additions and 1 deletions
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95
tests/test_classh_wip.cpp
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@ -100,7 +100,7 @@ struct type_caster<mpty> : smart_holder_type_caster_load<mpty> {
// type_caster_base BEGIN
// clang-format off
auto st = src_and_type(src);
return type_caster_generic::cast(
return cast( // Originally type_caster_generic::cast.
st.first, policy, parent, st.second,
make_copy_constructor(src), make_move_constructor(src));
// clang-format on
@ -188,6 +188,99 @@ struct type_caster<mpty> : smart_holder_type_caster_load<mpty> {
// clang-format on
// type_caster_base END
// Originally type_caster_generic::cast.
// clang-format off
PYBIND11_NOINLINE static handle cast(const void *_src, return_value_policy policy, handle parent,
const detail::type_info *tinfo,
void *(*copy_constructor)(const void *),
void *(*move_constructor)(const void *),
const void *existing_holder = nullptr) {
if (!tinfo) // no type info: error will be set already
return handle();
void *src = const_cast<void *>(_src);
if (src == nullptr)
return none().release();
auto it_instances = get_internals().registered_instances.equal_range(src);
for (auto it_i = it_instances.first; it_i != it_instances.second; ++it_i) {
for (auto instance_type : detail::all_type_info(Py_TYPE(it_i->second))) {
if (instance_type && same_type(*instance_type->cpptype, *tinfo->cpptype))
return handle((PyObject *) it_i->second).inc_ref();
}
}
auto inst = reinterpret_steal<object>(make_new_instance(tinfo->type));
auto wrapper = reinterpret_cast<instance *>(inst.ptr());
wrapper->owned = false;
void *&valueptr = values_and_holders(wrapper).begin()->value_ptr();
switch (policy) {
case return_value_policy::automatic:
case return_value_policy::take_ownership:
valueptr = src;
wrapper->owned = true;
break;
case return_value_policy::automatic_reference:
case return_value_policy::reference:
valueptr = src;
wrapper->owned = false;
break;
case return_value_policy::copy:
if (copy_constructor)
valueptr = copy_constructor(src);
else {
#if defined(NDEBUG)
throw cast_error("return_value_policy = copy, but type is "
"non-copyable! (compile in debug mode for details)");
#else
std::string type_name(tinfo->cpptype->name());
detail::clean_type_id(type_name);
throw cast_error("return_value_policy = copy, but type " +
type_name + " is non-copyable!");
#endif
}
wrapper->owned = true;
break;
case return_value_policy::move:
if (move_constructor)
valueptr = move_constructor(src);
else if (copy_constructor)
valueptr = copy_constructor(src);
else {
#if defined(NDEBUG)
throw cast_error("return_value_policy = move, but type is neither "
"movable nor copyable! "
"(compile in debug mode for details)");
#else
std::string type_name(tinfo->cpptype->name());
detail::clean_type_id(type_name);
throw cast_error("return_value_policy = move, but type " +
type_name + " is neither movable nor copyable!");
#endif
}
wrapper->owned = true;
break;
case return_value_policy::reference_internal:
valueptr = src;
wrapper->owned = false;
keep_alive_impl(inst, parent);
break;
default:
throw cast_error("unhandled return_value_policy: should not happen!");
}
tinfo->init_instance(wrapper, existing_holder);
return inst.release();
}
// clang-format on
};
template <>