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Bring in pybind11/detail/class.h, init.h as-is from smart_holder branch (does not build).

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This commit is contained in:
Ralf W. Grosse-Kunstleve 2024-06-30 10:00:33 -07:00
parent 33b0b387f1
commit dfaa49bb21
2 changed files with 78 additions and 3 deletions
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2
include/pybind11/detail/class.h
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@ -431,6 +431,8 @@ inline void clear_instance(PyObject *self) {
if (instance->owned || v_h.holder_constructed()) {
v_h.type->dealloc(v_h);
}
} else if (v_h.holder_constructed()) {
v_h.type->dealloc(v_h); // Disowned instance.
}
}
// Deallocate the value/holder layout internals:

79
include/pybind11/detail/init.h
View File

@ -10,6 +10,7 @@
#pragma once
#include "class.h"
#include "smart_holder_sfinae_hooks_only.h"
PYBIND11_NAMESPACE_BEGIN(PYBIND11_NAMESPACE)
@ -128,11 +129,14 @@ void construct(value_and_holder &v_h, Cpp<Class> *ptr, bool need_alias) {
// the holder and destruction happens when we leave the C++ scope, and the holder
// class gets to handle the destruction however it likes.
v_h.value_ptr() = ptr;
v_h.set_instance_registered(true); // To prevent init_instance from registering it
v_h.type->init_instance(v_h.inst, nullptr); // Set up the holder
v_h.set_instance_registered(true); // To prevent init_instance from registering it
v_h.set_instance_registered(true); // SHORTCUT To prevent init_instance from registering it
// DANGER ZONE BEGIN: exceptions will leave v_h in an invalid state.
v_h.type->init_instance(v_h.inst, nullptr); // Set up the holder
Holder<Class> temp_holder(std::move(v_h.holder<Holder<Class>>())); // Steal the holder
v_h.type->dealloc(v_h); // Destroys the moved-out holder remains, resets value ptr to null
v_h.set_instance_registered(false);
// DANGER ZONE END.
construct_alias_from_cpp<Class>(is_alias_constructible<Class>{}, v_h, std::move(*ptr));
} else {
@ -153,7 +157,9 @@ void construct(value_and_holder &v_h, Alias<Class> *alias_ptr, bool) {
// holder. This also handles types like std::shared_ptr<T> and std::unique_ptr<T> where T is a
// derived type (through those holder's implicit conversion from derived class holder
// constructors).
template <typename Class>
template <typename Class,
detail::enable_if_t<!detail::type_uses_smart_holder_type_caster<Cpp<Class>>::value, int>
= 0>
void construct(value_and_holder &v_h, Holder<Class> holder, bool need_alias) {
PYBIND11_WORKAROUND_INCORRECT_MSVC_C4100(need_alias);
auto *ptr = holder_helper<Holder<Class>>::get(holder);
@ -195,6 +201,73 @@ void construct(value_and_holder &v_h, Alias<Class> &&result, bool) {
v_h.value_ptr() = new Alias<Class>(std::move(result));
}
template <typename Class,
typename D = std::default_delete<Cpp<Class>>,
detail::enable_if_t<detail::type_uses_smart_holder_type_caster<Cpp<Class>>::value, int>
= 0>
void construct(value_and_holder &v_h, std::unique_ptr<Cpp<Class>, D> &&unq_ptr, bool need_alias) {
PYBIND11_WORKAROUND_INCORRECT_MSVC_C4100(need_alias);
auto *ptr = unq_ptr.get();
no_nullptr(ptr);
if (Class::has_alias && need_alias && !is_alias<Class>(ptr)) {
throw type_error("pybind11::init(): construction failed: returned std::unique_ptr pointee "
"is not an alias instance");
}
// Here and below: if the new object is a trampoline, the shared_from_this mechanism needs
// to be prevented from accessing the smart_holder vptr, because it does not keep the
// trampoline Python object alive. For types that don't inherit from enable_shared_from_this
// it does not matter if void_cast_raw_ptr is true or false, therefore it's not necessary
// to also inspect the type.
auto smhldr = type_caster<Cpp<Class>>::smart_holder_from_unique_ptr(
std::move(unq_ptr), /*void_cast_raw_ptr*/ Class::has_alias && is_alias<Class>(ptr));
v_h.value_ptr() = ptr;
v_h.type->init_instance(v_h.inst, &smhldr);
}
template <typename Class,
typename D = std::default_delete<Alias<Class>>,
detail::enable_if_t<detail::type_uses_smart_holder_type_caster<Alias<Class>>::value, int>
= 0>
void construct(value_and_holder &v_h,
std::unique_ptr<Alias<Class>, D> &&unq_ptr,
bool /*need_alias*/) {
auto *ptr = unq_ptr.get();
no_nullptr(ptr);
auto smhldr = type_caster<Alias<Class>>::smart_holder_from_unique_ptr(
std::move(unq_ptr), /*void_cast_raw_ptr*/ true);
v_h.value_ptr() = ptr;
v_h.type->init_instance(v_h.inst, &smhldr);
}
template <typename Class,
detail::enable_if_t<detail::type_uses_smart_holder_type_caster<Cpp<Class>>::value, int>
= 0>
void construct(value_and_holder &v_h, std::shared_ptr<Cpp<Class>> &&shd_ptr, bool need_alias) {
PYBIND11_WORKAROUND_INCORRECT_MSVC_C4100(need_alias);
auto *ptr = shd_ptr.get();
no_nullptr(ptr);
if (Class::has_alias && need_alias && !is_alias<Class>(ptr)) {
throw type_error("pybind11::init(): construction failed: returned std::shared_ptr pointee "
"is not an alias instance");
}
auto smhldr = type_caster<Cpp<Class>>::smart_holder_from_shared_ptr(shd_ptr);
v_h.value_ptr() = ptr;
v_h.type->init_instance(v_h.inst, &smhldr);
}
template <typename Class,
detail::enable_if_t<detail::type_uses_smart_holder_type_caster<Alias<Class>>::value, int>
= 0>
void construct(value_and_holder &v_h,
std::shared_ptr<Alias<Class>> &&shd_ptr,
bool /*need_alias*/) {
auto *ptr = shd_ptr.get();
no_nullptr(ptr);
auto smhldr = type_caster<Alias<Class>>::smart_holder_from_shared_ptr(shd_ptr);
v_h.value_ptr() = ptr;
v_h.type->init_instance(v_h.inst, &smhldr);
}
// Implementing class for py::init<...>()
template <typename... Args>
struct constructor {