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Minimal changes needed to pass test_classh_inheritance.

This commit is contained in:
Ralf W. Grosse-Kunstleve 2021-01-20 13:27:35 -08:00
parent dc537a0013
commit 383f7e9b84
1 changed files with 29 additions and 15 deletions
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44
include/pybind11/detail/classh_type_casters.h
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@ -35,7 +35,7 @@ public:
PYBIND11_NOINLINE modified_type_caster_generic_load_impl(const std::type_info &type_info)
: typeinfo(get_type_info(type_info)), cpptype(&type_info) { }
modified_type_caster_generic_load_impl(const type_info *typeinfo)
explicit modified_type_caster_generic_load_impl(const type_info *typeinfo = nullptr)
: typeinfo(typeinfo), cpptype(typeinfo ? typeinfo->cpptype : nullptr) { }
bool load(handle src, bool convert) {
@ -133,7 +133,7 @@ public:
}
// Case 2: We have a derived class
else if (PyType_IsSubtype(srctype, typeinfo->type)) {
auto &bases = all_type_info(srctype);
auto &bases = all_type_info(srctype); // subtype bases
bool no_cpp_mi = typeinfo->simple_type;
// Case 2a: the python type is a Python-inherited derived class that inherits from just
@ -144,6 +144,8 @@ public:
// pointer lookup overhead)
if (bases.size() == 1 && (no_cpp_mi || bases.front()->type == typeinfo->type)) {
this_.load_value_and_holder(reinterpret_cast<instance *>(src.ptr())->get_value_and_holder());
subtype_typeinfo = bases.front();
reinterpret_cast_ok = true;
return true;
}
// Case 2b: the python type inherits from multiple C++ bases. Check the bases to see if
@ -153,6 +155,8 @@ public:
for (auto base : bases) {
if (no_cpp_mi ? PyType_IsSubtype(base->type, typeinfo->type) : base->type == typeinfo->type) {
this_.load_value_and_holder(reinterpret_cast<instance *>(src.ptr())->get_value_and_holder(base));
subtype_typeinfo = base;
reinterpret_cast_ok = true;
return true;
}
}
@ -161,8 +165,9 @@ public:
// Case 2c: C++ multiple inheritance is involved and we couldn't find an exact type match
// in the registered bases, above, so try implicit casting (needed for proper C++ casting
// when MI is involved).
if (this_.try_implicit_casts(src, convert))
if (this_.try_implicit_casts(src, convert)) {
return true;
}
}
// Perform an implicit conversion
@ -192,7 +197,9 @@ public:
const type_info *typeinfo = nullptr;
const std::type_info *cpptype = nullptr;
const type_info *subtype_typeinfo = nullptr;
value_and_holder loaded_v_h;
bool reinterpret_cast_ok = false;
};
// clang-format on
@ -203,25 +210,32 @@ struct smart_holder_type_caster_load {
bool load(handle src, bool convert) {
if (!isinstance<T>(src))
return false;
modified_type_caster_generic_load_impl tcgli(typeid(T));
tcgli.load(src, convert);
loaded_v_h = tcgli.loaded_v_h;
loaded_smhldr_ptr = &loaded_v_h.holder<holder_type>();
load_impl = modified_type_caster_generic_load_impl(typeid(T));
if (!load_impl.load(src, convert))
return false;
loaded_smhldr_ptr = &load_impl.loaded_v_h.holder<holder_type>();
return true;
}
T *as_raw_ptr_unowned() {
if (load_impl.subtype_typeinfo != nullptr && load_impl.reinterpret_cast_ok) {
return reinterpret_cast<T *>(loaded_smhldr_ptr->vptr.get());
}
return loaded_smhldr_ptr->as_raw_ptr_unowned<T>();
}
std::unique_ptr<T> loaded_as_unique_ptr() {
void *value_void_ptr = loaded_v_h.value_ptr();
void *value_void_ptr = load_impl.loaded_v_h.value_ptr();
auto unq_ptr = loaded_smhldr_ptr->as_unique_ptr<T>();
loaded_v_h.holder<holder_type>().~holder_type();
loaded_v_h.set_holder_constructed(false);
loaded_v_h.value_ptr() = nullptr;
deregister_instance(loaded_v_h.inst, value_void_ptr, loaded_v_h.type);
load_impl.loaded_v_h.holder<holder_type>().~holder_type();
load_impl.loaded_v_h.set_holder_constructed(false);
load_impl.loaded_v_h.value_ptr() = nullptr;
deregister_instance(load_impl.loaded_v_h.inst, value_void_ptr, load_impl.loaded_v_h.type);
return unq_ptr;
}
protected:
value_and_holder loaded_v_h;
modified_type_caster_generic_load_impl load_impl;
holder_type *loaded_smhldr_ptr = nullptr;
};
@ -316,8 +330,8 @@ struct classh_type_caster : smart_holder_type_caster_load<T> {
operator T&&() && { return this->loaded_smhldr_ptr->template rvalue_ref<T>(); }
operator T const&() { return this->loaded_smhldr_ptr->template lvalue_ref<T>(); }
operator T&() { return this->loaded_smhldr_ptr->template lvalue_ref<T>(); }
operator T const*() { return this->loaded_smhldr_ptr->template as_raw_ptr_unowned<T>(); }
operator T*() { return this->loaded_smhldr_ptr->template as_raw_ptr_unowned<T>(); }
operator T const*() { return this->as_raw_ptr_unowned(); }
operator T*() { return this->as_raw_ptr_unowned(); }
// clang-format on