Campbell Barton
c434782e3a
Use a shorter/simpler license convention, stops the header taking so much space. Follow the SPDX license specification: https://spdx.org/licenses - C/C++/objc/objc++ - Python - Shell Scripts - CMake, GNUmakefile While most of the source tree has been included - `./extern/` was left out. - `./intern/cycles` & `./intern/atomic` are also excluded because they use different header conventions. doc/license/SPDX-license-identifiers.txt has been added to list SPDX all used identifiers. See P2788 for the script that automated these edits. Reviewed By: brecht, mont29, sergey Ref D14069
65 lines
1.5 KiB
C++
65 lines
1.5 KiB
C++
/* SPDX-License-Identifier: GPL-2.0-or-later */
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#pragma once
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#include <atomic>
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#include "BLI_function_ref.hh"
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#include "BLI_map.hh"
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#include "BLI_vector.hh"
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namespace blender::ed::spreadsheet {
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/**
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* A generic cache for the spreadsheet. Different data sources can cache custom data using custom
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* keys.
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*
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* Elements are removed from the cache when they are not used during a redraw.
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*/
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class SpreadsheetCache {
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public:
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class Key {
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public:
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virtual ~Key() = default;
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mutable bool is_used = false;
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virtual uint64_t hash() const = 0;
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friend bool operator==(const Key &a, const Key &b)
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{
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return a.is_equal_to(b);
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}
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private:
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virtual bool is_equal_to(const Key &other) const = 0;
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};
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class Value {
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public:
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virtual ~Value() = default;
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};
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private:
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Vector<std::unique_ptr<Key>> keys_;
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Map<std::reference_wrapper<const Key>, std::unique_ptr<Value>> cache_map_;
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public:
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/* Adding or looking up a key tags it as being used, so that it won't be removed. */
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void add(std::unique_ptr<Key> key, std::unique_ptr<Value> value);
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Value *lookup(const Key &key);
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Value &lookup_or_add(std::unique_ptr<Key> key,
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FunctionRef<std::unique_ptr<Value>()> create_value);
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void set_all_unused();
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void remove_all_unused();
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template<typename T> T &lookup_or_add(std::unique_ptr<Key> key)
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{
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return dynamic_cast<T &>(
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this->lookup_or_add(std::move(key), []() { return std::make_unique<T>(); }));
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}
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};
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} // namespace blender::ed::spreadsheet
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