Early Termination
suggest changeYou can extend the functionality of existing yield
methods by passing in one or more values or elements that could define a terminating condition within the function by calling a yield break
to stop the inner loop from executing.
public static IEnumerable<int> CountUntilAny(int start, HashSet<int> earlyTerminationSet)
{
int curr = start;
while (true)
{
if (earlyTerminationSet.Contains(curr))
{
// we've hit one of the ending values
yield break;
}
yield return curr;
if (curr == Int32.MaxValue)
{
// don't overflow if we get all the way to the end; just stop
yield break;
}
curr++;
}
}
The above method would iterate from a given start
position until one of the values within the earlyTerminationSet
was encountered.
// Iterate from a starting point until you encounter any elements defined as
// terminating elements
var terminatingElements = new HashSet<int>{ 7, 9, 11 };
// This will iterate from 1 until one of the terminating elements is encountered (7)
foreach(var x in CountUntilAny(1,terminatingElements))
{
// This will write out the results from 1 until 7 (which will trigger terminating)
Console.WriteLine(x);
}
Output:
1 2 3 4 5 6
Found a mistake? Have a question or improvement idea?
Let me know.
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