event-handling - 我可以在C++/CX中使用lambda处理事件吗？

Question

是否可以在C++/CX中使用lambda处理事件？例如，将这段代码从C#转换为C++/CX的最佳方法是什么？

this.animation.Completed += (s, e) =>
{
   animation.Begin();
};

Answer 1

是的，这是正确的语法。但是，我们建议您使用函数处理程序代替lambda，因为lambda会引入循环引用并阻止释放内存。

http://msdn.microsoft.com/en-us/library/windows/apps/xaml/hh755799.aspx

In general, it's better to use a named function, rather than a lambda, for an event handler unless you take great care to avoid circular references. A named function captures the "this" pointer by weak reference, whereas a lambda captures it by strong reference and creates a circular reference. For more information, see Weak references and breaking cycles (C++/CX).