将C++/CX“委托”对象转换为C++/WinRT中的等效对象

namespace winrt::MyApp::implementation
{
    struct MyDelegate : MyDelegateT<MyDelegate>
    {
        MyDelegate() = default;

        void Invoke() const
        {
            // 委托对象的实际处理逻辑
        }

        event_token MyEvent(Windows::Foundation::EventHandler<int32_t> const& handler)
        {
            return m_event.add(handler);
        }

        void MyEvent(event_token const& token) noexcept
        {
            m_event.remove(token);
        }

    private:
        winrt::event<Windows::Foundation::EventHandler<int32_t>> m_event;
    };
}

#include "MyDelegate.h"

using namespace winrt::MyApp::implementation;

void ConvertDelegate()
{
    MyDelegate^ cxDelegate = ref new MyDelegate();

    // 创建C++/WinRT等效对象
    MyDelegate winrtDelegate;
    winrtDelegate.Invocation(static_cast<Windows::Foundation::EventHandler<int32_t>>([cxDelegate](auto&&... args) { cxDelegate->Invoke(); }));

    // 关联事件
    winrtDelegate.MyEvent(static_cast<Windows::Foundation::EventHandler<int32_t>>([cxDelegate](auto&&... args) { cxDelegate->MyEvent(args...); }));

    // 使用C++/WinRT等效对象
    winrtDelegate.Invoke();
    winrtDelegate.MyEvent(42);
}