template <typename Compare>class CustomOrderList {public: void append(order::Order* pOrder) { m_orderList.insert(pOrder); } void remove(order::Order* pOrder) { m_orderList.erase(pOrder); } size_t size() const { return m_orderList.size(); } bool empty() const { return m_orderList.empty(); } template <typename Func> void apply(const Func& func) const { func(m_orderList); }private: std::set<order::Order*, Compare> m_orderList;}; 实现迭代器功能，const版本

可以通过定义一个内部类 Iterator 来实现迭代器功能，其中 const 版本需要返回 const 指针。

具体实现如下：

template <typename Compare>
class CustomOrderList {
public:
    // 内部迭代器类定义
    class Iterator {
        public:
            Iterator(typename std::set<order::Order*, Compare>::const_iterator it) : m_it(it) {}
            bool operator==(const Iterator& other) const { return m_it == other.m_it; }
            bool operator!=(const Iterator& other) const { return m_it != other.m_it; }
            order::Order* operator*() const { return *m_it; }
            Iterator& operator++() { ++m_it; return *this; }
        private:
            typename std::set<order::Order*, Compare>::const_iterator m_it;
    };

    void append(order::Order* pOrder) {
        m_orderList.insert(pOrder);
    }

    void remove(order::Order* pOrder) {
        m_orderList.erase(pOrder);
    }

    size_t size() const {
        return m_orderList.size();
    }

    bool empty() const {
        return m_orderList.empty();
    }

    // const 版本迭代器
    Iterator begin() const {
        return Iterator(m_orderList.cbegin());
    }

    Iterator end() const {
        return Iterator(m_orderList.cend());
    }

    template <typename Func>
    void apply(const Func& func) const {
        func(m_orderList);
    }

private:
    std::set<order::Order*, Compare> m_orderList;
};

使用示例：

CustomOrderList<MyCompare> orderList;
// 添加订单
orderList.append(new order::MarketOrder);
orderList.append(new order::LimitOrder);
orderList.append(new order::StopOrder);

// 遍历订单
for (auto it = orderList.begin(); it != orderList.end(); ++it) {
    std::cout << (*it)->getType() << std::endl;
}