本文介绍了一种技巧，即如何在变量超出作用域后继续观察堆上的对象值。通过获取对象地址并将其转换为指向该类型对象的指针，可以在调试器的监视窗口中继续跟踪该对象的状态。
Sometimes you'd like to watch the value of an object (on the heap) even after the symbol goes of scope.
When that happens, the variable in the Watch window is disabled and cannot be inspected any more (nor updated) even if the object is still alive and well.
It is possible to continue to watch it in full capability if you know the address of the object.
You can then cast the address to a pointer of the object type and put that in the Watch window.
In the example bellow, _foo is no longer accessible in the Watch window after stepping out of do_foo().
However, taking its address and casting it to foo* we can still watch the object.
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