BLI_memory_cache.hh

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/* SPDX-FileCopyrightText: 2024 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */
 
#pragma once
 
#include "BLI_function_ref.hh"
#include "BLI_generic_key.hh"
#include "BLI_memory_counter_fwd.hh"
 
namespace blender::memory_cache {
 
class CachedValue {
 public:
  virtual ~CachedValue() = default;
 
  virtual void count_memory(MemoryCounter &memory) const = 0;
};
 
template<typename T>
std::shared_ptr<const T> get(const GenericKey &key, FunctionRef<std::unique_ptr<T>()> compute_fn);
 
std::shared_ptr<CachedValue> get_base(const GenericKey &key,
                                      FunctionRef<std::unique_ptr<CachedValue>()> compute_fn);
 
void set_approximate_size_limit(int64_t limit_in_bytes);
 
void clear();
 
/* -------------------------------------------------------------------- */
template<typename T>
inline std::shared_ptr<const T> get(const GenericKey &key,
                                    FunctionRef<std::unique_ptr<T>()> compute_fn)
{
  return std::dynamic_pointer_cast<const T>(get_base(key, compute_fn));
}
 
}  // namespace blender::memory_cache