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How do you flag an enum?
enum Flags { A = 1 << 0, // binary 0001 B = 1 << 1, // binary 0010 C = 1 << 2, // binary 0100 D = 1 << 3 // binary 1000 }; It can hold values up to an int so that is, most of the time, 32 flags which is clearly reflected in the shift amount.
How many flags in int?
Since int is composed of 32 bits, it should be able to store 32 flags or a bool[] of length 32.
What is a flag in C sharp?
Flags allow an enum value to contain many values. An enum type with the [Flags] attribute can have multiple constant values assigned to it. With Flags, it is still possible to test enums in switches and if-statements. Flags can be removed or added.
How many bytes are in a flag?
The most common are 8-bit “byte” flags. A flags value can store boolean (true/false) values, integers, and enumerations. CF compliant NetCDF files only support booleans and enumerations. Byte flags are usually stored as unsigned integers.
What is FlagsAttribute?
Use the FlagsAttribute custom attribute for an enumeration only if a bitwise operation (AND, OR, EXCLUSIVE OR) is to be performed on a numeric value. Define enumeration constants in powers of two, that is, 1, 2, 4, 8, and so on. This means the individual flags in combined enumeration constants do not overlap.
What is Flag in TypeScript?
TypeScript provides both numeric and string-based enums. An enum can be stored as a single value, but storing a collection of enum values is verbose. A flagged enum can be used to efficiently send and store a collection of boolean values. In a flagged enum, each value of the enum is assigned to a bit value.
Is it necessary to store constants in int32?
By default, the System.Int32 data type is used to store the constant value. Even though you can change this underlying type, it is not necessary or recommended for most scenarios. No significant performance gain is achieved by using a data type that is smaller than Int32.
What’s the maximum number of flags for a bit mask?
“The underlying type is Int32 and so the maximum single bit flag is 1073741824 and obviously there are a total of 32 flags for each enum.” However… UPDATED:
When to use a byte or an Int32?
For situations where Int32 is not large enough to hold the values, use Int64. If backward compatibility requires a smaller data type, use Byte or Int16. Suppress a warning from this rule only if backward compatibility issues require it.
What to do when flags enum gets too large?
Not an answer to your question, but a related suggestion: we use bitshifting to specify the numeric values, like so: [Flags] public enum MyEnumFlags : Int64 { None = 0, A = 1 << 0, B = 1 << 1, C = 1 << 2, D = 1 << 3, E = 1 << 4, F = 1 << 5, …etc…
https://www.youtube.com/watch?v=p3yoFnwsSeU