Unity engine ui11/18/2023 Now the compiler searches System before searching Outer, finds System.Math, and all is well. This changes if you put the using inside your namespace declaration, as follows: // File1b.cs Unfortunately (or perhaps fortunately?), Outer.Math has no PI member, so File1 is now broken. The compiler searches Outer before looking at those using directives outside the namespace, so it finds Outer.Math instead of System.Math. Now imagine that someone adds another file (File2.cs) to the project that looks like this: // File2.cs Imagine you have the following code in File1.cs: // File1.cs There is actually a (subtle) difference between the two. You can find more info about the flags attribute and its usage at msdn and designing flags at msdn However, you can perform a logical, not a bitwise, comparison between the numeric value and the None enumerated constant to determine whether any bits in the numeric value are set. You cannot use the None enumerated constant in a bitwise AND operation to test for a flag because the result is always zero. Use None as the name of the flag enumerated constant whose value is zero. So when you retrieve the value you are actually performing bitwise AND & on the values: myProperties.AllowedColors: 00001110Ġ0000010 // Hey, this is the same as M圜olor.Green!Īnd regarding the use of 0 in your enumeration, quoting from MSDN: Similarly, after you've set your property AllowedColors to Red, Green and Blue using the binary bitwise OR | operator, AllowedColors looks like this: myProperties.AllowedColors: 00001110 Under the covers, your enumeration values look like this in binary ones and zeros: Yellow: 00000001 This works because you used powers of two in your enumeration. If((myProperties.AllowedColors & M圜olor.Green) = M圜olor.Green) NET 4: if((myProperties.AllowedColors & M圜olor.Yellow) = M圜olor.Yellow) To retrieve the distinct values in your property, one can do this: if ((M圜olor.Yellow)) Here's an example of a correct declaration: ![]() The values, if declared this way, will be Yellow = 0, Green = 1, Red = 2, Blue = 3. If you omit the numeric values, the enum will not work as one might expect in bitwise operations, because by default the values start with 0 and increment. It is also important to note that does not automatically make the enum values powers of two. ![]() Var str2 = (SuitsFlags.Spades | SuitsFlags.Diamonds).ToString() Var str1 = (Suits.Spades | Suits.Diamonds).ToString() Note that the attribute doesn't enable this by itself - all it does is allow a nice representation by the. Such collections are often used with bitwise operators, for example: var allowedColors = M圜olor.Red | M圜olor.Green | M圜olor.Blue The attribute should be used whenever the enumerable represents a collection of possible values, rather than a single value.
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