Ejemplo n.º 1
0
        public static async Task LinqIoTest()
        {
            var init        = 5;
            var console     = new List <string>();
            var computation =
                from x in MaybeT.Lift(new Io <int>(() => Task.FromResult(1)))
                from y in MaybeT.Lift(Io.AsIo(() => Task.FromResult(2)))
                from _ in MaybeT.HoistIo(Maybe.JustIf(init > 0, () => new Unit()))
                from z in MaybeT.Lift(Io.AsIo(() => { console.Add("func run"); return(Task.FromResult(init)); }))
                select x + y + z;

            var value = await computation.Run.Run();

            Assert.True(value.HasValue);
            Assert.Equal(1 + 2 + init, value.Value());
            Assert.Single(console);

            init    = 0;
            console = new List <string>();

            value = await computation.Run.Run();

            Assert.False(value.HasValue);
            Assert.Empty(console);
        }