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129934ad9f
* Factor out detail/value_and_holder.h (from detail/type_caster_base.h) This is in support of PR #5213: * trampoline_self_life_support.h depends on value_and_holder.h * type_caster_base.h depends on trampoline_self_life_support.h * Fix a minor and inconsequential inconsistency in `copyable_holder_caster`: the correct `load_value()` return type is `void` (as defined in `type_caster_generic`) For easy future reference, this is the long-standing inconsistency: *dbf848aff7/include/pybind11/detail/type_caster_base.h (L634)*dbf848aff7/include/pybind11/cast.h (L797)Noticed in passing while working on PR #5213. * Add `DANGER ZONE` comment in detail/init.h, similar to a comment added on the smart_holder branch (all the way back in 2021).
78 lines
2.7 KiB
C++
78 lines
2.7 KiB
C++
// Copyright (c) 2016-2024 The Pybind Development Team.
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// All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#pragma once
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#include "common.h"
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#include <cstddef>
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#include <typeinfo>
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PYBIND11_NAMESPACE_BEGIN(PYBIND11_NAMESPACE)
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PYBIND11_NAMESPACE_BEGIN(detail)
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struct value_and_holder {
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instance *inst = nullptr;
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size_t index = 0u;
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const detail::type_info *type = nullptr;
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void **vh = nullptr;
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// Main constructor for a found value/holder:
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value_and_holder(instance *i, const detail::type_info *type, size_t vpos, size_t index)
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: inst{i}, index{index}, type{type},
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vh{inst->simple_layout ? inst->simple_value_holder
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: &inst->nonsimple.values_and_holders[vpos]} {}
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// Default constructor (used to signal a value-and-holder not found by get_value_and_holder())
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value_and_holder() = default;
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// Used for past-the-end iterator
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explicit value_and_holder(size_t index) : index{index} {}
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template <typename V = void>
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V *&value_ptr() const {
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return reinterpret_cast<V *&>(vh[0]);
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}
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// True if this `value_and_holder` has a non-null value pointer
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explicit operator bool() const { return value_ptr() != nullptr; }
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template <typename H>
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H &holder() const {
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return reinterpret_cast<H &>(vh[1]);
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}
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bool holder_constructed() const {
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return inst->simple_layout
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? inst->simple_holder_constructed
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: (inst->nonsimple.status[index] & instance::status_holder_constructed) != 0u;
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}
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// NOLINTNEXTLINE(readability-make-member-function-const)
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void set_holder_constructed(bool v = true) {
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if (inst->simple_layout) {
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inst->simple_holder_constructed = v;
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} else if (v) {
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inst->nonsimple.status[index] |= instance::status_holder_constructed;
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} else {
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inst->nonsimple.status[index] &= (std::uint8_t) ~instance::status_holder_constructed;
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}
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}
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bool instance_registered() const {
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return inst->simple_layout
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? inst->simple_instance_registered
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: ((inst->nonsimple.status[index] & instance::status_instance_registered) != 0);
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}
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// NOLINTNEXTLINE(readability-make-member-function-const)
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void set_instance_registered(bool v = true) {
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if (inst->simple_layout) {
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inst->simple_instance_registered = v;
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} else if (v) {
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inst->nonsimple.status[index] |= instance::status_instance_registered;
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} else {
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inst->nonsimple.status[index] &= (std::uint8_t) ~instance::status_instance_registered;
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}
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}
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};
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PYBIND11_NAMESPACE_END(detail)
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PYBIND11_NAMESPACE_END(PYBIND11_NAMESPACE)
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