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// SPDX-License-Identifier: LGPL-3.0-or-later
// Author: Kristian Lytje
#pragma once
#include <api/api_helper.h>
#include <unordered_map>
#include <functional>
#include <memory>
namespace ausaxs::api {
/**
* @brief A simple storage for C++ objects that need to stay in memory for use in Python.
* This avoids the need for C-style memory management despite being bound by a C API.
*/
struct ObjectStorage {
struct StoredObject {
void* ptr;
std::function<void(void*)> deleter;
};
template<typename T> static int register_object(T&& obj);
template<typename T> static int register_object(std::unique_ptr<T> obj);
/**
* @brief Get an object by its ID. Manual type casting is required.
*/
template<typename T> static T* get_object(int id);
/**
* @brief Deregister an object, deleting it and freeing its memory.
*/
static void deregister_object(int id);
static inline int current_id = 1;
static inline std::unordered_map<int, StoredObject> storage;
};
template<typename T>
int ObjectStorage::register_object(T&& obj) {
int id = current_id++;
T* ptr = new T(std::move(obj));
storage.emplace(id, StoredObject{
.ptr=static_cast<void*>(ptr),
.deleter=[](void* p) { delete static_cast<T*>(p); }
});
return id;
}
template<typename T>
int ObjectStorage::register_object(std::unique_ptr<T> obj) {
int id = current_id++;
T* ptr = obj.release(); // take ownership
storage.emplace(id, StoredObject{ ptr,
[](void* p){ delete static_cast<T*>(p); }});
return id;
}
template<typename T>
inline T* ObjectStorage::get_object(int id) {
auto it = storage.find(id);
if (it != storage.end()) {
return static_cast<T*>(it->second.ptr);
}
return nullptr;
}
inline void ObjectStorage::deregister_object(int id) {
auto it = storage.find(id);
if (it != storage.end()) {
it->second.deleter(it->second.ptr);
storage.erase(it);
}
}
}
extern "C" API void deallocate(int object_id, int* status);
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