在“模板基类”中调用模板方法的错误

Question

下面的代码不能编译，为什么？我该如何解决这个问题？

struct A{ 
    template<int N> int get() { return N; } 
}; 

template <typename X> 
struct B : public X { 
    template<int N> int get() { 
     return X::get<N>(); 
    } 
}; 

int main(int argc, const char *argv[]) 
{ 
    B<A> b; 
    return b.get<5>(); 
} 

编译器错误：

test.cxx: In member function ‘int B<X>::get()’: 
test.cxx:8:30: error: expected primary-expression before ‘)’ token 
test.cxx: In member function ‘int B<X>::get() [with int N = 5, X = A]’: 
test.cxx:15:25: instantiated from here 
test.cxx:8:30: error: invalid operands of types ‘<unresolved overloaded function type>’ and ‘int’ to binary ‘operator<’ 

Answer 1

必须消除歧义它，就像这样：

template<int N>int get() { 
    return X::template get<N>(); 
}