访问嵌套命名空间C外的元素时出现问题++

我的整个项目都有一个很大的命名空间,然后每个组件(文件)在该文件中都有自己的嵌套命名空间。大命名空间称为IEEngine,嵌套命名空间称为IEAewever(例如IEWindow)。但是,我该如何从IEEngine::IEWhatever2访问IEEngine::IEWhatever2。当我执行IEEngine::IEWhatever::Something时,我收到一个错误,即命名空间IEEngine中没有成员IEWhatever。我包含了提供名称空间IEWWhatever的文件。但是该文件还包括提供IEWhatever2的文件,因此它错误地说IEWhatever未定义(include放在IEWhatever1命名空间之前)。我该如何修复这个IE?有些东西也不起作用。我也试过了 使用Something=IE Whatever:某物;但那行不通

IEDisplay.hpp:

#ifndef IEDISPLAY_HPP
#define IEDISPLAY_HPP

#ifndef IEWINDOW_HPP
#include "IEWindow.hpp"
#endif // IEWINDOW_HPP


#include <wayland-client.h>
#include <wayland-cursor.h>

#include "external/wayland-protocols/tearing-control-v1/tearing-control-v1.h"
#include "external/wayland-protocols/xdg-shell/xdg-shell-client-protocol.h"
#include "external/wayland-protocols/viewporter/viewporter-client-protocol.h"



namespace IEEngine {
    namespace IEDisplay {
        class WLDisplay {   
            private:
                struct wl_display* display;
                struct wl_registry* registry;
                struct wl_compositor* compositor;
                struct xdg_wm_base* wm_base;
                struct wl_seat* seat;
                struct wl_pointer* pointer;
                struct wl_touch* touch;
                struct wl_keyboard* keyboard;
                struct wl_shm* shm;
                struct wl_cursor_theme* cursor_theme;
                struct wl_cursor* cursor;
                struct wl_surface* cursor_surface;
                struct wp_tearing_control_manager_v1* tearing_manager;
                struct wp_viewporter* viewporter;
                struct wp_fractional_scale_manager_v1* fractional_scale_manager;
                IEWindow::WLWindow window;
        };
    }
}


#endif // IEDISPLAY_HPP

IEWindow.hpp:

#ifndef IEWINDOW_HPP
#define IEWINDOW_HPP




#ifndef IEDISPLAY_HPP
#include "IEDisplay.hpp"
#endif // IEDISPLAY_HPP

namespace IEEngine {
    namespace IEWindow {
        class WLWindow {    
            IEDisplay::WLDisplay display;
            int wHeight;
            int wWidth;
        };
    }
}



#endif // IEWINDOW_HPP