Instance Method

insert(_:)

Adds the given element to the option set if it is not already a member.

Declaration

@discardableResult mutating func insert(_ newMember: DispatchIO.CloseFlags) -> (inserted: Bool, memberAfterInsert: DispatchIO.CloseFlags)

Parameters

newMember

The element to insert.

Return Value

(true, newMember) if newMember was not contained in self. Otherwise, returns (false, oldMember), where oldMember is the member of the set equal to newMember.

Discussion

In the following example, the .secondDay shipping option is added to the freeOptions option set if purchasePrice is greater than 50.0. For the ShippingOptions declaration, see the OptionSet protocol discussion.

let purchasePrice = 87.55

var freeOptions: ShippingOptions = [.standard, .priority]
if purchasePrice > 50 {
    freeOptions.insert(.secondDay)
}
print(freeOptions.contains(.secondDay))
// Prints "true"