要检查是否设置了位值：
int value = VALUE_TO_CHECK | OTHER_VALUE_TO_CHECK;
if ((value & VALUE_TO_CHECK) == VALUE_TO_CHECK)
{
// do something--it was set
}
if ((value & OTHER_VALUE_TO_CHECK) == OTHER_VALUE_TO_CHECK)
{
// also set (if it gets in here, then it was defined in
// value, but it does not guarantee that it was set with
// OR without other values. To guarantee it's only this
// value just use == without bitwise logic)
}
重要的是要注意，除非它表示All或None(并且不使用按位逻辑比较;只使用value == 0)，因为任何值& 0始终为0。
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