public DecayingDouble Add(TimeSpan halfLife, DecayingDouble amountToAdd)
{
if (!LastUpdatedUtc.HasValue)
{
return(new DecayingDouble(ValueAtTimeOfLastUpdate + amountToAdd.ValueAtTimeOfLastUpdate, amountToAdd.LastUpdatedUtc));
}
else if (!amountToAdd.LastUpdatedUtc.HasValue)
{
return(new DecayingDouble(ValueAtTimeOfLastUpdate + amountToAdd.ValueAtTimeOfLastUpdate, LastUpdatedUtc));
}
else if (LastUpdatedUtc.Value > amountToAdd.LastUpdatedUtc.Value)
{
return(new DecayingDouble(
ValueAtTimeOfLastUpdate + amountToAdd.GetValue(halfLife, LastUpdatedUtc.Value),
LastUpdatedUtc.Value));
}
else
{
return(new DecayingDouble(amountToAdd.ValueAtTimeOfLastUpdate + GetValue(halfLife, amountToAdd.LastUpdatedUtc.Value), amountToAdd.LastUpdatedUtc.Value));
}
}
public DecayingDouble Subtract(TimeSpan halfLife, DecayingDouble amountToRemove)
{
if (!LastUpdatedUtc.HasValue)
{
return(new DecayingDouble(ValueAtTimeOfLastUpdate - amountToRemove.ValueAtTimeOfLastUpdate, amountToRemove.LastUpdatedUtc));
}
else if (!amountToRemove.LastUpdatedUtc.HasValue)
{
return(new DecayingDouble(ValueAtTimeOfLastUpdate - amountToRemove.ValueAtTimeOfLastUpdate, LastUpdatedUtc));
}
else if (LastUpdatedUtc.Value > amountToRemove.LastUpdatedUtc.Value)
{
return
(new DecayingDouble(
ValueAtTimeOfLastUpdate - amountToRemove.GetValue(halfLife, LastUpdatedUtc.Value),
LastUpdatedUtc.Value));
}
else
{
return(new DecayingDouble(amountToRemove.ValueAtTimeOfLastUpdate - GetValue(halfLife, amountToRemove.LastUpdatedUtc.Value), amountToRemove.LastUpdatedUtc.Value));
}
}
