如果不想使用Node结构体，可以考虑使用std::atomic
以下是修改后的LockFreeQueue代码：
#include <atomic>#include <condition_variable>#include <iostream>#include <thread>template <typename T>class LockFreeQueue{public:LockFreeQueue() : head_(nullptr), tail_(nullptr) {}~LockFreeQueue(){while (T *const old_head = head_){head_ = old_head->next_;delete old_head;}}void push(const T &value){T *new_node = new T(value);new_node->next_ = nullptr;T *tail = tail_.load(std::memory_order_relaxed);if (tail){tail->next_ = new_node;}else{// first elementhead_ = new_node;}tail_.store(new_node, std::memory_order_release);size_.fetch_add(1, std::memory_order_release);}bool try_pop(T &value){T *const old_head = head_.load(std::memory_order_relaxed);if (!old_head){return false;}T *const new_head = old_head->next_;value = *old_head;head_.store(new_head, std::memory_order_release);size_.fetch_sub(1, std::memory_order_release);return true;}bool empty() const{return size_.load(std::memory_order_acquire) == 0;}private:struct Node{T value_;std::atomic<Node*> next_;Node() : next_(nullptr) {}explicit Node(const T &value) : value_(value), next_(nullptr) {}};std::atomic<T*> head_;std::atomic<T*> tail_;std::atomic<size_t> size_{0};std::condition_variable cv_;};
