public override FVList <T> Where(int localCount, Predicate <T> keep, WListProtected <T> forWList)
{
// Optimization
Debug.Assert(localCount > 0);
if (keep(_1))
{
if (localCount == 2)
{
if (keep(_2))
{
_immCount = 2; // Mark immutable if it isn't already
return(MakeResult(this, 2, forWList));
}
}
if (_immCount == MutableFlag)
{
_immCount = 1; // Ensure first item is immutable
}
return(MakeResult(this, 1, forWList));
}
else
{
if (localCount == 2 && keep(_2))
{
return(MakeResult(_2, forWList));
}
else
{
return(new FVList <T>());
}
}
}
protected WListProtected(WListProtected <T> original, bool takeOwnership)
: this(original.Block, original.LocalCount, takeOwnership&& original.IsOwner)
{
if (IsOwner)
{
original.IsOwner = false;
}
byte userByte = original.UserByte;
if (userByte != 0)
{
UserByte = userByte;
}
}
public override FVList <T> SmartSelect(int _localCount, Func <T, T> map, WListProtected <T> forWList)
{
// Optimization
T item, item2;
Debug.Assert(_localCount > 0);
if (EqualityComparer.Equals(item = map(_1), _1))
{
if (_localCount == 2)
{
if (EqualityComparer.Equals(item2 = map(_2), _2))
{
_immCount = 2; // Mark immutable if it isn't already
return(MakeResult(this, 2, forWList));
}
else
{
return(MakeResult(item, item2, forWList));
}
}
else
{
if (_immCount == MutableFlag)
{
_immCount = 1; // Ensure first item is immutable
}
return(MakeResult(this, 1, forWList));
}
}
else
{
if (_localCount == 2)
{
return(MakeResult(item, map(_2), forWList));
}
else
{
return(MakeResult(item, forWList));
}
}
}
public override FVList <T> WhereSelect(int _localCount, Func <T, Maybe <T> > map, WListProtected <T> forWList)
{ // Optimization
Maybe <T> item, item2;
Debug.Assert(_localCount > 0);
if (IsSame(_1, item = map(_1)))
{
if (_localCount == 2)
{
if (IsSame(_2, item2 = map(_2)))
{
_immCount = 2; // Mark immutable if it isn't already
return(MakeResult(this, 2, forWList));
}
else
{
return(MakeResult(item.Value, item2.Value, forWList));
}
}
else
{
if (_immCount == MutableFlag)
{
_immCount = 1; // Ensure first item is immutable
}
return(MakeResult(this, 1, forWList));
}
}
else if (!item.HasValue)
{
if (_localCount == 1 || !(item2 = map(_2)).HasValue)
{
Debug.Assert(forWList == null || forWList.Count == 0);
return(FVList <T> .Empty);
}
else
{
return(MakeResult(item2.Value, forWList));
}
}
else
{
if (_localCount == 1 || !(item2 = map(_2)).HasValue)
{
return(MakeResult(item.Value, forWList));
}
else
{
return(MakeResult(item.Value, item2.Value, forWList));
}
}
}
