public static async Task <R> MatchAsync <T, R>(this Task <TryOption <T> > self, Func <T, R> Succ, Func <R> None, Func <Exception, R> Fail) =>
await self.ContinueWith(trySelf =>
{
TryOptionResult <T> res = trySelf.Result.Try();
return(res.IsFaulted
? Fail(res.Exception)
: res.Value.IsSome
? Succ(res.Value.Value)
: None());
});
public static IObservable <R> MatchObservable <T, R>(this IObservable <TryOption <T> > self, Func <T, R> Succ, Func <R> None, Func <Exception, R> Fail) =>
self.Select(trySelf =>
{
TryOptionResult <T> res = trySelf.Try();
return(res.IsFaulted
? Fail(res.Exception)
: res.Value.IsSome
? Succ(res.Value.Value)
: None());
});
public static TryOption <V> SelectMany <T, U, V>(
this TryOption <T> self,
Func <T, TryOption <U> > bind,
Func <T, U, V> project
)
{
return(new TryOption <V>(
() =>
{
var resT = self.Try();
if (resT.IsFaulted)
{
return new TryOptionResult <V>(resT.Exception);
}
if (resT.Value.IsNone)
{
return new TryOptionResult <V>(None);
}
var resU = bind(resT.Value.Value).Try();
if (resU.IsFaulted)
{
return new TryOptionResult <V>(resU.Exception);
}
if (resU.Value.IsNone)
{
return new TryOptionResult <V>(None);
}
try
{
var res = new TryOptionResult <V>(project(resT.Value.Value, resU.Value.Value));
return res;
}
catch (Exception e)
{
TryConfig.ErrorLogger(e);
return new TryOptionResult <V>(e);
}
}
));
}
