MSVC 2008错误"类型"不是结构(尽管它是)

Question

以下MWE在gcc 4.8.2上编译,但在MSVC 2008(公司政策)上没有编译

struct B
{
};

struct A
{
    typedef B Handler;
};

template<typename T>
struct Foo
{
    typedef typename T::Handler  Type;
};

template<typename T>
struct Bar
{
    friend struct Foo<T>::Type;     // MSVC 2008 does not like this
    typedef typename Foo<T>::Type   Foo;
};

int main() 
{
}

MSVC 2008错误

error C2649: 'Foo<T>::Type' : is not a 'struct'

这是编译器错误还是我在这里做了非法的事情？更重要的是有修复吗？

Answer 1

删除struct关键字并将其替换为typename:

template<typename T>
struct Bar
{
    friend typename Foo<T>::Type;     
    typedef typename Foo<T>::Type   Foo;
};