void clearCache()
{
//methodCache.Clear();
cache = null;
}
internal BinOpCacheEntry(Type key1, Type key2, Object val, BinOpCacheEntry next)
{
this.key1 = key1;
this.key2 = key2;
this.val = val;
this.next = next;
}
void cacheMethod(Type t1, Type t2, Object method)
{
//if can find an existing entry, swap the value
BinOpCacheEntry e = findCacheEntry(t1, t2);
if (e == null)
cache = new BinOpCacheEntry(t1, t2, method, cache);
else
e.val = method;
}