public static AsyncObserverExpression <TSource> Then([NotNull] AsyncObserverExpression <TSource> left, [NotNull] AsyncObserverExpression <TSource> right)
{
Contract.NotNull(left, nameof(left));
Contract.NotNull(right, nameof(right));
if (left.m_handler != null)
{
var f = left.m_handler;
if (right.m_handler != null)
{
var g = right.m_handler;
return(new AsyncObserverExpression <TSource>((x) => { f(x); g(x); }));
}
else
{
var g = right.m_asyncHandler;
return(new AsyncObserverExpression <TSource>((x, ct) => { f(x); return g(x, ct); }));
}
}
else
{
var f = left.m_asyncHandler;
if (right.m_asyncHandler != null)
{
var g = right.m_asyncHandler;
return(new AsyncObserverExpression <TSource>(async(x, ct) => { await f(x, ct).ConfigureAwait(false); await g(x, ct).ConfigureAwait(false); }));
}
else
{
var g = right.m_handler;
return(new AsyncObserverExpression <TSource>(async(x, ct) => { await f(x, ct).ConfigureAwait(false); g(x); }));
}
}
}
public AsyncObserverExpression <TSource> Then(AsyncObserverExpression <TSource> expr)
{
return(Then(this, expr));
}