If flag is declared to have type atomic<bool> or atomic_bool(C/C++) or volatile boolean(Java), and is initially false then the following snippet is data-race-free.
NET is an object, including all of the primitive types(Short, Integer, Long, String, Boolean, etc.) and user defined types, events, and even assemblies.
It happens in logical operations(later we will meet condition tests and other similar things) but can also be performed explicitly with a call to Boolean(value).
但是,SQL没有类似于BOOLEAN的数据类型。
However, SQL has no data type equivalent to BOOLEAN.
SQL:1999还引入了BOOLEAN类型变量,根据标准也可以是未知值。
SQL: 1999 also introduced BOOLEAN type variables, which according to the standard can also hold Unknown values.
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