public IMethod Find(BinaryOperator op, IType left, IType right)
{
string key = ((int)op).ToString() + (int)left.SystemType().Code + (int)right.SystemType().Code;
IMethod m;
if (!_cache.TryGetValue(key, out m))
{
m = op.FindMethod(left, right);
if (m != null)
{
_cache.Add(key, m);
}
}
return(m);
}