Swift Language OptionSet OptionSet Protocol
Example
OptionSetType is a protocol designed to represent bit mask types where individual bits represent members of the set. A set of logical and/or functions enforce the proper syntax:
struct Features : OptionSet {
let rawValue : Int
static let none = Features(rawValue: 0)
static let feature0 = Features(rawValue: 1 << 0)
static let feature1 = Features(rawValue: 1 << 1)
static let feature2 = Features(rawValue: 1 << 2)
static let feature3 = Features(rawValue: 1 << 3)
static let feature4 = Features(rawValue: 1 << 4)
static let feature5 = Features(rawValue: 1 << 5)
static let all: Features = [feature0, feature1, feature2, feature3, feature4, feature5]
}
Features.feature1.rawValue //2
Features.all.rawValue //63
var options: Features = [.feature1, .feature2, .feature3]
options.contains(.feature1) //true
options.contains(.feature4) //false
options.insert(.feature4)
options.contains(.feature4) //true
var otherOptions : Features = [.feature1, .feature5]
options.contains(.feature5) //false
options.formUnion(otherOptions)
options.contains(.feature5) //true
options.remove(.feature5)
options.contains(.feature5) //false
