visitor.h

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#pragma once
 
 
namespace eu::gui
{
    struct Button;
    struct PanelWidget;
}
 
 
namespace eu::gui
{
    struct Visitor
    {
        Visitor() = default;
        virtual ~Visitor() = default;
        Visitor(const Visitor& other) = delete;
        void operator=(const Visitor&) = delete;
        Visitor(Visitor&& other) = delete;
        void operator=(Visitor&&) = delete;
 
        virtual
        void
        visit(Button* button) = 0;
 
        virtual
        void
        visit(PanelWidget* button) = 0;
    };
}