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Revert "Experiment: restoring original smart_holder_type_casters.h from smart_holder branch."

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This reverts commit 19c5a3613fee71878ba2af0339eed325a5916089.
This commit is contained in:
Ralf W. Grosse-Kunstleve 2021-06-06 16:11:51 -07:00 committed by Ralf W. Grosse-Kunstleve
parent 2ae3c2ceb7
commit 5f92b4ff1c
1 changed files with 55 additions and 6 deletions
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61
include/pybind11/detail/smart_holder_type_casters.h
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@ -26,6 +26,11 @@
#include <typeinfo>
#include <utility>
#ifdef JUNK
# include <iostream>
inline void to_cout(std::string msg) { std::cout << msg << std::endl; }
#endif
PYBIND11_NAMESPACE_BEGIN(PYBIND11_NAMESPACE)
using pybindit::memory::smart_holder;
@ -270,6 +275,31 @@ struct smart_holder_type_caster_class_hooks : smart_holder_type_caster_base_tag
return &modified_type_caster_generic_load_impl::local_load;
}
using holder_type = pybindit::memory::smart_holder;
#ifdef JUNK
template <typename WrappedType>
static bool try_initialization_using_shared_from_this(holder_type *, WrappedType *, ...) {
return false;
}
#endif
#ifdef JUNK
template <typename WrappedType, typename AnyBaseOfWrappedType>
static bool try_initialization_using_shared_from_this(
holder_type *uninitialized_location,
WrappedType *value_ptr_w_t,
const std::enable_shared_from_this<AnyBaseOfWrappedType> *) {
auto shd_ptr = std::dynamic_pointer_cast<WrappedType>(
detail::try_get_shared_from_this(value_ptr_w_t));
if (!shd_ptr)
return false;
// Note: inst->owned ignored.
new (uninitialized_location) holder_type(holder_type::from_shared_ptr(shd_ptr));
return true;
}
#endif
template <typename WrappedType, typename AliasType>
static void init_instance_for_type(detail::instance *inst, const void *holder_const_void_ptr) {
// Need for const_cast is a consequence of the type_info::init_instance type:
@ -281,17 +311,27 @@ struct smart_holder_type_caster_class_hooks : smart_holder_type_caster_base_tag
register_instance(inst, v_h.value_ptr(), v_h.type);
v_h.set_instance_registered();
}
using holder_type = pybindit::memory::smart_holder;
if (holder_void_ptr) {
// Note: inst->owned ignored.
auto holder_ptr = static_cast<holder_type *>(holder_void_ptr);
new (std::addressof(v_h.holder<holder_type>())) holder_type(std::move(*holder_ptr));
} else if (inst->owned) {
new (std::addressof(v_h.holder<holder_type>())) holder_type(
holder_type::from_raw_ptr_take_ownership(v_h.value_ptr<WrappedType>()));
} else {
new (std::addressof(v_h.holder<holder_type>()))
holder_type(holder_type::from_raw_ptr_unowned(v_h.value_ptr<WrappedType>()));
#ifdef JUNK
if (!try_initialization_using_shared_from_this(
std::addressof(v_h.holder<holder_type>()),
v_h.value_ptr<WrappedType>(),
v_h.value_ptr<WrappedType>())) {
#endif
if (inst->owned) {
new (std::addressof(v_h.holder<holder_type>())) holder_type(
holder_type::from_raw_ptr_take_ownership(v_h.value_ptr<WrappedType>()));
} else {
new (std::addressof(v_h.holder<holder_type>())) holder_type(
holder_type::from_raw_ptr_unowned(v_h.value_ptr<WrappedType>()));
}
#ifdef JUNK
}
#endif
}
v_h.holder<holder_type>().pointee_depends_on_holder_owner
= dynamic_raw_ptr_cast_if_possible<AliasType>(v_h.value_ptr<WrappedType>()) != nullptr;
@ -364,11 +404,20 @@ struct smart_holder_type_caster_load {
auto type_raw_ptr = convert_type(void_raw_ptr);
if (holder().pointee_depends_on_holder_owner) {
// Tie lifetime of trampoline Python part to C++ part (PR #2839).
#ifdef JUNK
to_cout("");
to_cout("LOOOK " + std::to_string(__LINE__) + " " + __FILE__);
#endif
return std::shared_ptr<T>(
type_raw_ptr,
shared_ptr_dec_ref_deleter{
handle((PyObject *) load_impl.loaded_v_h.inst).inc_ref()});
}
#ifdef JUNK
if (holder().vptr_is_using_noop_deleter) {
throw std::runtime_error("Non-owning holder (loaded_as_shared_ptr).");
}
#endif
std::shared_ptr<void> void_shd_ptr = holder().template as_shared_ptr<void>();
return std::shared_ptr<T>(void_shd_ptr, type_raw_ptr);
}