public static async Task ForEachAsync <T>(this IAsyncFastEnumerable <T> source, Func <T, Task> next)
{
var e = source.GetAsyncEnumerator();
try
{
while (await e.WaitForNextAsync().ConfigureAwait(false))
{
while (true)
{
var item = e.TryGetNext(out var success);
if (!success)
{
break;
}
await next(item).ConfigureAwait(false);
}
}
}
finally
{
await e.DisposeAsync().ConfigureAwait(false);
}
}
public override async Task <bool> MoveNextAsync()
{
switch (_state)
{
case 1:
_enumerator = _source.GetAsyncEnumerator();
_state = 2;
goto case 2;
case 2:
do
{
while (true)
{
var item = _enumerator.TryGetNext(out var success);
if (!success)
{
break;
}
else
{
_current = item;
return(true);
}
}
} while (await _enumerator.WaitForNextAsync().ConfigureAwait(false));
break;
}
return(false);
}
public static async Task <R> Aggregate <T, R>(this IAsyncFastEnumerable <T> source, R seed, Func <R, T, Task <R> > aggregate)
{
var res = seed;
var e = source.GetAsyncEnumerator();
try
{
while (await e.WaitForNextAsync().ConfigureAwait(false))
{
while (true)
{
var item = e.TryGetNext(out var success);
if (!success)
{
break;
}
res = await aggregate(res, item).ConfigureAwait(false);
}
}
}
finally
{
await e.DisposeAsync().ConfigureAwait(false);
}
return(res);
}
public override Task <bool> WaitForNextAsync()
{
switch (_state)
{
case 1:
_enumerator = _source.GetAsyncEnumerator();
_state = 2;
goto case 2;
case 2:
return(_enumerator.WaitForNextAsync());
}
return(False);
}
public override async Task <bool> WaitForNextAsync()
{
switch (_state)
{
case 1:
_enumerator = _source.GetAsyncEnumerator();
_state = 2;
goto case 2;
case 2:
do
{
while (true)
{
var item = _enumerator.TryGetNext(out var success);
if (!success)
{
break;
}
else
{
if (await _predicate(item).ConfigureAwait(false))
{
_hasNext = true;
_next = item;
return(true);
}
}
}
}while (await _enumerator.WaitForNextAsync().ConfigureAwait(false));
break;
}
_hasNext = false;
_next = default(T);
return(false);
}
