这个队列中使用了Node结构体来表示队列中的节点，如果不想使用Node结构体，可以考虑使用std::atomicstd::shared_ptr<T>来代替。具体实现如下：
#include <atomic>#include <condition_variable>#include <iostream>#include <memory>#include <thread>template <typename T>class LockFreeQueue{public:LockFreeQueue() : head_(std::make_shared<Node>()), tail_(head_.load()) {}~LockFreeQueue(){while (std::shared_ptr<Node> old_head = std::atomic_load_explicit(&head_, std::memory_order_relaxed)){head_ = std::atomic_load_explicit(&old_head->next_, std::memory_order_relaxed);}}void push(const T &value){auto new_node = std::make_shared<Node>(value);auto tail = std::atomic_load_explicit(&tail_, std::memory_order_relaxed);std::atomic_store_explicit(&tail->next_, new_node, std::memory_order_release);std::atomic_store_explicit(&tail_, new_node, std::memory_order_release);size_.fetch_add(1, std::memory_order_release);}bool try_pop(T &value){auto const old_head = std::atomic_load_explicit(&head_, std::memory_order_relaxed);auto const new_head = std::atomic_load_explicit(&old_head->next_, std::memory_order_relaxed);if (!new_head){return false;}value = new_head->value_;std::atomic_store_explicit(&head_, new_head, std::memory_order_release);size_.fetch_sub(1, std::memory_order_release);return true;}bool empty() const{return std::atomic_load_explicit(&size_, std::memory_order_acquire) == 0;}private:struct Node{T value_;std::shared_ptr<Node> next_;Node() : next_(nullptr) {}explicit Node(const T &value) : value_(value), next_(nullptr) {}};std::shared_ptr<Node> head_;std::shared_ptr<Node> tail_;std::atomic<size_t> size_{0};std::condition_variable cv_;};
