LiftedUserDefinedOperator LiftUserDefinedOperator(IMethod m)
{
if (IsComparisonOperator(m)) {
if (!m.ReturnType.Equals(compilation.FindType(KnownTypeCode.Boolean)))
return null; // cannot lift this operator
} else {
if (!NullableType.IsNonNullableValueType(m.ReturnType))
return null; // cannot lift this operator
}
for (int i = 0; i < m.Parameters.Count; i++) {
if (!NullableType.IsNonNullableValueType(m.Parameters[i].Type))
return null; // cannot lift this operator
}
return new LiftedUserDefinedOperator(m);
}