我有一个基类,它基本上包含将一个类附加到任意窗口句柄(例如,HWND、HFONT),并使用一个策略类来附加/分离和销毁:
// class SmartHandle
template<typename THANDLE, class TWRAPPER, class TPOLICY>
class SmartHandle : boost::noncopyable
{
private:
TPOLICY* m_pPolicy; // Policy
bool m_bIsTemporary; // Is this a temporary window?
SmartHandle(); // no default ctor
SmartHandle(const SmartHandle<THANDLE, TWRAPPER, TPOLICY>&); // no cctor
protected:
THANDLE m_hHandle; // Handle to the underlying window
TPOLICY& policy() {return(*m_pPolicy);};
// ctor that attaches but is temporary
SmartHandle(const THANDLE& _handle, bool _temporary) : m_hHandle(_handle)
, m_bIsTemporary(_temporary)
{
m_pPolicy = new TPOLICY(reinterpret_cast<TWRAPPER&>(*this));
if(_handle)
m_pPolicy->attach(_handle);
}; // eo ctor
// move ctor
SmartHandle(SmartHandle<THANDLE, TWRAPPER, TPOLICY>&& _rhs) : m_hHandle(_rhs.m_hHandle)
, m_bIsTemporary(_rhs.m_bIsTemporary)
{
m_pPolicy = new TPOLICY(reinterpret_cast<TWRAPPER&>(*this));
m_pPolicy->attach(m_hHandle);
const_cast<SmartHandle&>(_rhs).m_hHandle = NULL;
}; // eo mtor
// dtor
virtual ~SmartHandle()
{
if(m_hHandle)
{
m_pPolicy->detach(m_hHandle);
if(!m_bIsTemporary)
m_pPolicy->destroy(m_hHandle);
m_hHandle = NULL;
};
delete(m_pPolicy);
m_pPolicy = NULL;
}; // eo dtor
请注意,我已将复制构造函数声明为私有(没有实现),因为我不希望复制该类,但允许移动。
我的Window
课程源于此:
class GALLOW_API Window : SmartHandle<HWND, Window, detail::_hWndPolicy>
{
friend class Application;
private:
static LRESULT CALLBACK wndProc(HWND _hWnd, UINT _message, WPARAM _wParam, LPARAM _lParam);
// no copy/default ctor
Window();
Window(const Window&);
protected:
public:
static const String ClassName;
Window(const HWND& _hWnd);
Window(const WindowCreateInfo& _createInfo);
Window(Window&& _rhs);
virtual ~Window();
}; // eo class Window
再一次,复制默认/复制ctors。移动构造函数的实现是:
Window::Window(Window&& _rhs) : SmartHandle(_rhs)
{
}; // eo mtor
但是,在编译期间,我在移动构造函数实现的第一行收到以下错误:
1>c:\\documents\visual studio 2010\projects\gallow\gallow\window.cpp(81): error C2248: 'gallow::SmartHandle<THANDLE,TWRAPPER,TPOLICY>::SmartHandle' : cannot access private member declared in class 'gallow::SmartHandle<THANDLE,TWRAPPER,TPOLICY>'
因此,它看起来好像是在尝试调用复制构造函数(我已将其声明为私有)而不是移动构造函数。我在这里缺少一些简单的东西吗?
提前致谢。
编辑:修改 mtor 所以它是非常量的,错误仍然存在。EDIT2:我正在使用 Visual C++ 2010。