feat(tools): add RecentQueue to replace std::deque in server_world

include/Cubed/gameplay/server_world.hpp

@@ -6,6 +6,7 @@
 #include "Cubed/gameplay/river_worm.hpp"
 #include "Cubed/gameplay/server_chunk.hpp"
 #include "Cubed/gameplay/server_player.hpp"
+#include "Cubed/tools/recent_queue.hpp"
 #include "Cubed/tools/thread_pool.hpp"
 #include "world/block_change.pb.h"
 
@@ -128,7 +129,7 @@ private:
     std::mutex m_need_gen_queue_mutex;
     std::condition_variable_any m_gen_cv;
 
-    std::deque<std::string> m_need_gen_queue;
+    RecentQueue<std::string> m_need_gen_queue;
 
     std::atomic<std::shared_ptr<ThreadPool>> m_gen_thread_pool;
 

include/Cubed/tools/recent_queue.hpp

@@ -0,0 +1,55 @@
+#pragma once
+#include <list>
+#include <unordered_map>
+namespace Cubed {
+template <typename T> class RecentQueue {
+private:
+    std::list<T> m_list;
+    std::unordered_map<T, typename std::list<T>::iterator> m_map;
+
+public:
+    void enqueue(T key) {
+        auto it = m_map.find(key);
+        if (it != m_map.end()) {
+            m_list.splice(m_list.end(), m_list, it->second);
+            return;
+        }
+        m_list.emplace_back(std::move(key));
+        auto iter = std::prev(m_list.end());
+        m_map.emplace(*iter, iter);
+    }
+
+    void pop() {
+        if (m_list.empty()) {
+            return;
+        }
+        m_map.erase(m_list.front());
+        m_list.pop_front();
+    }
+    void clear() {
+        m_list.clear();
+        m_map.clear();
+    }
+
+    const T& front() const {
+        assert(!empty());
+        return m_list.front();
+    }
+    const T& back() const {
+        assert(!empty());
+        return m_list.back();
+    }
+    [[nodiscard]]
+    bool empty() const {
+        return m_list.empty();
+    }
+    [[nodiscard]]
+    size_t size() const {
+        return m_list.size();
+    }
+    [[nodiscard]]
+    bool contains(const T& key) const {
+        return m_map.find(key) != m_map.end();
+    }
+};
+} // namespace Cubed