我在学习CRTP C++模式
我的代码

template<class Type>
class BaseOrder {
public:
    void sendOrder() {static_cast<Type*>(this)->send();}
    void send() { cout << "Send Base" << endl;}
};
class DerivedOrder1 : public BaseOrder<DerivedOrder1> {
public:
    void send() { cout << "Send DerivedOrder1" << endl;}
};
class DerivedOrder2 : public BaseOrder<DerivedOrder2> {
public:
    void send() { cout << "Send DerivedOrder2" << endl;}
};
template<class T>
void handleOrder(BaseOrder<T> order) {
    order.send();
}
int main() {
    BaseOrder<DerivedOrder1> obj1;
    handleOrder(obj1); // Send Base
    BaseOrder<DerivedOrder2> obj2;
    handleOrder(obj2); // Send Base
}

字符串
我看到输出：

Send Base
Send Base

型
但我预计

Send DerivedOrder1
Send DerivedOrder2

型
如何修复我的代码？我错过了什么吗？