Vega processors included a custom read barrier instruction that included bit field checking in reference metadata as well as special virtual memory protection for GC-compacted pages.
Vega处理器包含了一个客户化的读屏障指令，它具有字段检查元数据和针对GC压缩页面的特殊的虚拟内存保护。
In this case, instead of checking to see if the field was blank we could invoke a method on a model object to ensure that the current user wasn't already in the system.
在该例中，不是检查字段是否为空，我们可以调用模型对象的方法来确保当前用户已经不在系统中。
We can now create a view that lists only books that are available for purchase by checking that the State field is not no Longer Published.
我们现在可以创建一个视图来显示目前可以订购的书籍，这可以通过检查State字段的值并确定它不是No Longer Published来实现。
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