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diff --git a/src/lib/netlist/core/queue.h b/src/lib/netlist/core/queue.h
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+// license:BSD-3-Clause
+// copyright-holders:Couriersud
+
+///
+/// \file queue.h
+///
+
+#ifndef NL_CORE_QUEUE_H_
+#define NL_CORE_QUEUE_H_
+
+#include "../nl_errstr.h"
+#include "../nltypes.h"
+#include "queue.h"
+
+#include "../plib/pstate.h"
+#include "../plib/pstring.h"
+#include "../plib/ptimed_queue.h"
+
+#include <array>
+#include <queue>
+#include <unordered_map>
+#include <utility>
+#include <vector>
+
+namespace netlist::detail
+{
+ // -----------------------------------------------------------------------------
+ // queue_t
+ // -----------------------------------------------------------------------------
+
+ // We don't need a thread-safe queue currently. Parallel processing of
+ // solvers will update inputs after parallel processing.
+
+ template <typename A, typename O>
+ class queue_base
+ : public config::timed_queue<A, plib::queue_entry_t<netlist_time_ext, O *>>
+ , public plib::state_manager_t::callback_t
+ {
+ public:
+ using entry_t = plib::queue_entry_t<netlist_time_ext, O *>;
+ using base_queue = config::timed_queue<A, entry_t>;
+ using id_delegate = plib::pmfp<std::size_t(const O *)>;
+ using obj_delegate = plib::pmfp<O *(std::size_t)>;
+
+ explicit queue_base(A &arena, std::size_t size, id_delegate get_id,
+ obj_delegate get_obj)
+ : base_queue(arena, size)
+ , m_size(0)
+ , m_times(size)
+ , m_net_ids(size)
+ , m_get_id(get_id)
+ , m_obj_by_id(get_obj)
+ {
+ }
+
+ ~queue_base() noexcept override = default;
+
+ queue_base(const queue_base &) = delete;
+ queue_base(queue_base &&) = delete;
+ queue_base &operator=(const queue_base &) = delete;
+ queue_base &operator=(queue_base &&) = delete;
+
+ protected:
+ void register_state(plib::state_manager_t &manager,
+ const pstring & module) override
+ {
+ manager.save_item(this, m_size, module + "." + "size");
+ manager.save_item(this, &m_times[0], module + "." + "times",
+ m_times.size());
+ manager.save_item(this, &m_net_ids[0], module + "." + "names",
+ m_net_ids.size());
+ }
+ void on_pre_save(
+ [[maybe_unused]] plib::state_manager_t &manager) override
+ {
+ m_size = this->size();
+ for (std::size_t i = 0; i < m_size; i++)
+ {
+ m_times[i] = this->list_pointer()[i].exec_time().as_raw();
+ m_net_ids[i] = m_get_id(this->list_pointer()[i].object());
+ }
+ }
+ void on_post_load(
+ [[maybe_unused]] plib::state_manager_t &manager) override
+ {
+ this->clear();
+ for (std::size_t i = 0; i < m_size; i++)
+ {
+ O *n = m_obj_by_id(m_net_ids[i]);
+ this->template push<false>(
+ entry_t(netlist_time_ext::from_raw(m_times[i]), n));
+ }
+ }
+
+ private:
+ std::size_t m_size;
+ std::vector<netlist_time_ext::internal_type> m_times;
+ std::vector<std::size_t> m_net_ids;
+ id_delegate m_get_id;
+ obj_delegate m_obj_by_id;
+ };
+
+ using queue_t = queue_base<device_arena, net_t>;
+
+} // namespace netlist::detail
+
+#endif // NL_CORE_QUEUE_H_