C++ 模板实例化歧义

我在玩一个FSM的游戏，遇到了一个模棱两可的问题，如下所示：

/home/permal/code/FSM/Test/../FSM/dist/include/FSM.h: In instantiation of ‘void fsm::FSM<FSMBaseState>::Event(std::unique_ptr<EventType>) [with EventType = AddEvent; FSMBaseState = EventBaseState]’:
/home/permal/code/FSM/Test/test.cpp:83:44:   required from here
/home/permal/code/FSM/Test/../FSM/dist/include/FSM.h:59:4: error: request for member ‘Event’ is ambiguous
    myCurrent->Event( std::move( event ) );
    ^
In file included from /home/permal/code/FSM/Test/../FSM/dist/include/FSM.h:12:0,
                 from /home/permal/code/FSM/Test/test.cpp:8:
/home/permal/code/FSM/Test/../FSM/dist/include/EventReceiver.h:15:15: note: candidates are: void fsm::EventReceiver<EventType>::Event(std::unique_ptr<_Tp>) [with EventType = SubtractEvent]
  virtual void Event( std::unique_ptr<EventType> event ) = 0;
               ^
/home/permal/code/FSM/Test/../FSM/dist/include/EventReceiver.h:15:15: note:                 void fsm::EventReceiver<EventType>::Event(std::unique_ptr<_Tp>) [with EventType = AddEvent]
In file included from /home/permal/code/FSM/Test/test.cpp:8:0:
/home/permal/code/FSM/Test/../FSM/dist/include/FSM.h: In instantiation of ‘void fsm::FSM<FSMBaseState>::Event(std::unique_ptr<EventType>) [with EventType = SubtractEvent; FSMBaseState = EventBaseState]’:
/home/permal/code/FSM/Test/test.cpp:91:50:   required from here
/home/permal/code/FSM/Test/../FSM/dist/include/FSM.h:59:4: error: request for member ‘Event’ is ambiguous
    myCurrent->Event( std::move( event ) );

template<typename EventType>
class EventReceiver
{
public:
    virtual void Event( std::unique_ptr<EventType> event ) = 0;
};

其中，

EventReceiver

定义如下：

/home/permal/code/FSM/Test/../FSM/dist/include/FSM.h: In instantiation of ‘void fsm::FSM<FSMBaseState>::Event(std::unique_ptr<EventType>) [with EventType = AddEvent; FSMBaseState = EventBaseState]’:
/home/permal/code/FSM/Test/test.cpp:83:44:   required from here
/home/permal/code/FSM/Test/../FSM/dist/include/FSM.h:59:4: error: request for member ‘Event’ is ambiguous
    myCurrent->Event( std::move( event ) );
    ^
In file included from /home/permal/code/FSM/Test/../FSM/dist/include/FSM.h:12:0,
                 from /home/permal/code/FSM/Test/test.cpp:8:
/home/permal/code/FSM/Test/../FSM/dist/include/EventReceiver.h:15:15: note: candidates are: void fsm::EventReceiver<EventType>::Event(std::unique_ptr<_Tp>) [with EventType = SubtractEvent]
  virtual void Event( std::unique_ptr<EventType> event ) = 0;
               ^
/home/permal/code/FSM/Test/../FSM/dist/include/EventReceiver.h:15:15: note:                 void fsm::EventReceiver<EventType>::Event(std::unique_ptr<_Tp>) [with EventType = AddEvent]
In file included from /home/permal/code/FSM/Test/test.cpp:8:0:
/home/permal/code/FSM/Test/../FSM/dist/include/FSM.h: In instantiation of ‘void fsm::FSM<FSMBaseState>::Event(std::unique_ptr<EventType>) [with EventType = SubtractEvent; FSMBaseState = EventBaseState]’:
/home/permal/code/FSM/Test/test.cpp:91:50:   required from here
/home/permal/code/FSM/Test/../FSM/dist/include/FSM.h:59:4: error: request for member ‘Event’ is ambiguous
    myCurrent->Event( std::move( event ) );

template<typename EventType>
class EventReceiver
{
public:
    virtual void Event( std::unique_ptr<EventType> event ) = 0;
};

---

当然，由提供的解决方案也有效。

基类的方法在通过派生类实例调用时不参与“跨类”重载。 你必须把它放在一个地方

using EventReceiver<AddEvent>::Event;
using EventReceiver<SubtractEvent>::Event;

---

使用EventReceiver
myCurrent->Event（std:：move（Event））这是重要的一行。
myCurrent
和
event
的类型是什么？在调用
myCurrent->Event（std:：move（Event））的函数中，这两个变量的声明准确程度如何
@AaronMcDaid这是一个问题：
myCurrent
是
EventBaseState
而
event
是
std:：unique\u ptr
或
std:：unique\u ptr
。你可能是正确的，我会在尝试后将此标记为答案。我必须说，编译器消息真的把你引向了错误的道路——它实际上声明有两个候选对象可用，但随后忽略了它们。
using EventReceiver<AddEvent>::Event;
using EventReceiver<SubtractEvent>::Event;