public class Container2: RandomAccessCollection
{
public typealias Indices = DefaultRandomAccessIndices<Container2>;
public typealias Index = Int;
//typealias SubSequence = Container2;
public var arr:[Int] = [1,2,3,4,5];
public var endIndex: Index {
return 5;
}
public var startIndex:Index{
return 0;
}
public func index(after i: Int) -> Int{
return i+1;
}
public subscript(position: Int) -> Int{
get{
return arr[position];
} set{
arr[position] = newValue;
}
}
/*func index(before i: Int) -> Int{
return i-1;
}*/
public subscript(bounds: Range<Int>) -> Container2{
get{
return Container2();
} set{
}
}
}
I'm trying to adopt the RandomAccessCollection protocol from a class. I
deliberately leave out the func index(before:) function because there is
already a default implementation of that function in RandomAccessCollection. I
do understand that that function's implementation is required because of
BiDirectionalCollection from which RandomAccessCollection inherits.
My question is why would the compiler complain that func index(before:)
implementation is required when there is already a default implementation in
RandomAccessCollection that i can use?
Thanks.
_______________________________________________
swift-users mailing list
swift-users@swift.org
https://lists.swift.org/mailman/listinfo/swift-users
