c++ - 枚举有问题

Question

我有这样的东西:

enum Direction{Forward,Backward};

template<Direction dir = Forward>
class X
{
private:

    Direction my_direction_;
public:

    void set_direction(Direction dir)//here I'm getting an error
    {
        my_direction_ = dir;
    }

};

错误:'Direction dir' 声明
有什么理由吗？顺便说一句，它确实是用 VS2010 编译的。

Answer 1

改变:

template<Direction dir = Forward>

到

template<Direction direction = Forward>

error on gcc 更具描述性:

prog.cpp: In member function ‘void X<dir>::set_direction(Direction)’:
prog.cpp:11: error: declaration of ‘Direction dir’
prog.cpp:3: error:  shadows template parm ‘Direction dir’