Mammoth/Couscous/java/util/OptionalInt.cs


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47

using Mammoth.Couscous.java.util.function;

namespace Mammoth.Couscous.java.util
{
    internal interface OptionalInt
	{
		bool isPresent();
		int getAsInt();
		int orElse(int elseValue);
    }

	internal struct NoneInt : OptionalInt {
		internal static readonly NoneInt Instance = new NoneInt();
		
		public bool isPresent() {
			return false;
		}

		public int getAsInt() {
			throw new NoSuchElementException();
		}
		
		public int orElse(int elseValue) {
			return elseValue;
		}
	}

	internal struct SomeInt : OptionalInt {
		private readonly int _value;

		internal SomeInt(int value) {
			_value = value;
		}

		public bool isPresent() {
			return true;
		}

		public int getAsInt() {
			return _value;
		}
		
		public int orElse(int elseValue) {
			return _value;
		}
	}
}