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不确定这是否是 MSVC 2013 终极版中的错误，但它在 2015 社区中运行良好。声明：https ://github.com/dtmoodie/MetaObject/blob/master/include/MetaObject/Signals/TypedSignal.hpp

class IMetaObject;
class Context;
class Connection;
template<class Sig> class TypedSignalRelay;
template<class Sig> class TypedSignal{};
template<class...T> class MO_EXPORTS TypedSignal<void(T...)> : public ISignal
{
    std::shared_ptr<Connection> Connect(ISlot* slot);
    std::shared_ptr<Connection> Connect(std::shared_ptr<ISignalRelay>& relay);
    std::shared_ptr<Connection> Connect(std::shared_ptr<TypedSignalRelay<void(T...)>>& relay);
};

template<class R, class...T> class MO_EXPORTS TypedSignal<R(T...)> : public ISignal
{
    std::shared_ptr<Connection> Connect(ISlot* slot);
    std::shared_ptr<Connection> Connect(std::shared_ptr<ISignalRelay>& relay);
    std::shared_ptr<Connection> Connect(std::shared_ptr<TypedSignalRelay<R(T...)>>& relay);
};

定义： https ://github.com/dtmoodie/MetaObject/blob/master/include/MetaObject/Signals/detail/TypedSignalImpl.hpp

------------- 返回值特化 ---------

template<class R, class...T>
std::shared_ptr<Connection> TypedSignal<R(T...)>::Connect(ISlot* slot)
{
    return slot->Connect(this);
}

template<class R, class...T>
std::shared_ptr<Connection> TypedSignal<R(T...)>::Connect(std::shared_ptr<ISignalRelay>& relay)
{
    ...
}

template<class R, class...T>
std::shared_ptr<Connection> TypedSignal<R(T...)>::Connect(std::shared_ptr<TypedSignalRelay<R(T...)>>& relay)
{
    ....
}

-------- void 返回特化 -------------

template<class...T>
std::shared_ptr<Connection> TypedSignal<void(T...)>::Connect(ISlot* slot)
{
    return slot->Connect(this);
}

template<class...T>
std::shared_ptr<Connection> TypedSignal<void(T...)>::Connect(std::shared_ptr<ISignalRelay>& relay)
{
    ...
}

template<class...T>
std::shared_ptr<Connection> TypedSignal<void(T...)>::Connect(std::shared_ptr<TypedSignalRelay<void(T...)>>& relay)
{
    ...
}

在 2013 年出现此错误，但在 2015 年没有投诉：

4>e:\code\metaobject\include\metaobject\signals\detail/TypedSignalImpl.hpp(77): error C2244: 'mo::TypedSignal<R(T...)>::Connect' : unable to match function definition to an existing declaration
4>          definition
4>          'std::shared_ptr<mo::Connection> mo::TypedSignal<R(T...)>::Connect(std::shared_ptr<mo::TypedSignalRelay<R(T...)>> &)'
4>          existing declarations
4>          'std::shared_ptr<mo::Connection> mo::TypedSignal<R(T...)>::Connect(std::shared_ptr<mo::TypedSignalRelay<R(T...)>> &)'
4>          'std::shared_ptr<mo::Connection> mo::TypedSignal<R(T...)>::Connect(std::shared_ptr<mo::ISignalRelay> &)'
4>          'std::shared_ptr<mo::Connection> mo::TypedSignal<R(T...)>::Connect(mo::ISlot *)'

[编辑] 添加了完整的示例和原始源的链接。

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