public No31_DefineApiConbinableSequence()
{
//目的：
//①遅延実行で組み合わせたクエリを１度のみ操作できる
//概要：
//--------------------------------------------------------------------------------------
//イテレータメソッド（yield return）を実装することで、
//再利用可能な遅延実行メソッドを実装できる
//利用時
var nums = new List <int>()
{
1, 1, 2, 3, 3, 4, 5, 6, 7, 8
};
var list = new List <string>()
{
"a", "b", "a", "d", "c", "d", "j", "i", "d", "j",
};
//NG
//処理が１つに内包されていて、再利用不可能
ProduceMethod.UniqueWrite(nums);
//OK
//イテレータメソッドとすることで再利用可能に
IteratorMethod.UniqueWrite(nums);
//さらにジェネリクスにすることで再利用可能に
var res = IteratorMethod.Unique(list);
}
private void DoApply(IteratorMethod method, int i, IActor actor)
{
CollectionBehaviors <T> linkedBehavior = LinkedTo as CollectionBehaviors <T>;
switch (method)
{
case IteratorMethod.MoveNext:
{
if ((i < linkedBehavior.List.Count) && (i >= 0))
{
actor.SendMessage(IteratorMethod.OkMoveNext, true);
}
else
{
actor.SendMessage(IteratorMethod.OkMoveNext, false);
}
break;
}
case IteratorMethod.Current:
{
if ((i >= 0) && (i < linkedBehavior.List.Count))
{
actor.SendMessage(IteratorMethod.OkCurrent, linkedBehavior.List[i]);
}
else
{
Debug.WriteLine("Bad current");
}
break;
}
default: throw new ActorException(string.Format(CultureInfo.InvariantCulture, "Bad IteratorMethod call {0}", method));
}
}
public static void ForEach <TIn, TOut>(
IteratorMethod <TIn, TOut> iteratorMethod,
Action <TIn, Action <TOut> > forEach)
{
IEnumerator <TIn> enumerator = null;
try
{
enumerator = new YieldEnumerable <TIn, TOut>(iteratorMethod).GetEnumerator();
var enumerator2 = (YieldEnumerator <TIn, TOut>)enumerator;
while (enumerator.MoveNext())
{
try
{
forEach(enumerator2.Current, enumerator2.Return);
}
catch (Exception x) // Oh the humanity!
{
enumerator2.Throw(x);
}
}
}
finally
{
enumerator?.Dispose();
}
}
public TimeProfiler(IteratorMethod method)
{
if (method == IteratorMethod.foreachNonLazyCoding)
{
profile_foreachNonLazyCoding();
}
if (method == IteratorMethod.foreachLazyCoding)
{
profile_foreachLazyCoding();
}
if (method == IteratorMethod.forLoopCoding)
{
profile_forLoopCoding();
}
}
/// <summary>Iterate through all Entities in this EntityContainer.</summary>
/// <remarks>This method can modify objects during iteration!
/// If this functionality is undesired, iterate then through this
/// EntityContainer using a 'foreach'-loop (from IEnumerable).</remarks>
public void Iterate(IteratorMethod iterator)
{
var count = entities.Count;
var newList = new List <Entity>(count);
// iterate through entities
for (int i = 0; i < count; i++)
{
iterator(entities[i]);
}
// keep Entities that have not been marked for deletion during iteration
foreach (var entity in entities)
{
if (!entity.IsDeleted())
{
newList.Add(entity);
}
}
entities = newList;
}
public YieldEnumerator(IteratorMethod <TItem, TResult> iteratorMethod)
{
_task = iteratorMethod(this);
}
public YieldEnumerable(IteratorMethod <TItem, TResult> iteratorMethod)
{
_iteratorMethod = iteratorMethod;
}