public static IfEqual Instance(int key, int value, Behavior result, Behavior no = null)
{
var k = new Tuple<int, int, Behavior, Behavior>(key, value, result, no);
IfEqual ret;
if (!instances.TryGetValue(k, out ret))
ret = instances[k] = new IfEqual(key, value, result, no);
return ret;
}
new RunBehaviors(
IfEqual.Instance(-1, 1,