112 lines
3.7 KiB
C++
112 lines
3.7 KiB
C++
/* SPDX-FileCopyrightText: 2023 Blender Authors
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*
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* SPDX-License-Identifier: GPL-2.0-or-later */
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#pragma once
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#include "BLI_generic_pointer.hh"
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#include "BLI_linear_allocator.hh"
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#include "BLI_map.hh"
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namespace blender {
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/**
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* This is a map that stores key-value-pairs. What makes it special is that the type of values does
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* not have to be known at compile time. There just has to be a corresponding CPPType.
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*/
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template<typename Key> class GValueMap {
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private:
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/* Used to allocate values owned by this container. */
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LinearAllocator<> &allocator_;
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Map<Key, GMutablePointer> values_;
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public:
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GValueMap(LinearAllocator<> &allocator) : allocator_(allocator) {}
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~GValueMap()
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{
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/* Destruct all values that are still in the map. */
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for (GMutablePointer value : values_.values()) {
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value.destruct();
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}
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}
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/* Add a value to the container. The container becomes responsible for destructing the value that
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* is passed in. The caller remains responsible for freeing the value after it has been
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* destructed. */
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template<typename ForwardKey> void add_new_direct(ForwardKey &&key, GMutablePointer value)
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{
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values_.add_new_as(std::forward<ForwardKey>(key), value);
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}
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/* Add a value to the container that is move constructed from the given value. The caller remains
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* responsible for destructing and freeing the given value. */
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template<typename ForwardKey> void add_new_by_move(ForwardKey &&key, GMutablePointer value)
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{
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const CPPType &type = *value.type();
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void *buffer = allocator_.allocate(type.size(), type.alignment());
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type.move_construct(value.get(), buffer);
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values_.add_new_as(std::forward<ForwardKey>(key), GMutablePointer{type, buffer});
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}
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/* Add a value to the container that is copy constructed from the given value. The caller remains
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* responsible for destructing and freeing the given value. */
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template<typename ForwardKey> void add_new_by_copy(ForwardKey &&key, GPointer value)
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{
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const CPPType &type = *value.type();
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void *buffer = allocator_.allocate(type.size(), type.alignment());
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type.copy_construct(value.get(), buffer);
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values_.add_new_as(std::forward<ForwardKey>(key), GMutablePointer{type, buffer});
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}
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/* Add a value to the container. */
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template<typename ForwardKey, typename T> void add_new(ForwardKey &&key, T &&value)
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{
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if constexpr (std::is_rvalue_reference_v<T>) {
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this->add_new_by_move(std::forward<ForwardKey>(key), &value);
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}
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else {
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this->add_new_by_copy(std::forward<ForwardKey>(key), &value);
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}
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}
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/* Remove the value for the given name from the container and remove it. The caller is
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* responsible for freeing it. The lifetime of the referenced memory might be bound to lifetime
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* of the container. */
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template<typename ForwardKey> GMutablePointer extract(const ForwardKey &key)
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{
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return values_.pop_as(key);
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}
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template<typename ForwardKey> GPointer lookup(const ForwardKey &key) const
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{
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return values_.lookup_as(key);
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}
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/* Remove the value for the given name from the container and remove it. */
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template<typename T, typename ForwardKey> T extract(const ForwardKey &key)
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{
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GMutablePointer value = values_.pop_as(key);
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const CPPType &type = *value.type();
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BLI_assert(type.is<T>());
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T return_value;
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type.relocate_assign(value.get(), &return_value);
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return return_value;
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}
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template<typename T, typename ForwardKey> const T &lookup(const ForwardKey &key) const
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{
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GMutablePointer value = values_.lookup_as(key);
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BLI_assert(value.is_type<T>());
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BLI_assert(value.get() != nullptr);
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return *(const T *)value.get();
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}
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template<typename ForwardKey> bool contains(const ForwardKey &key) const
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{
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return values_.contains_as(key);
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}
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};
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} // namespace blender
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