| (* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| *) |
| |
| theory I_TrustLevel |
| imports Main "../TrustLevel" |
| begin |
| |
| datatype TrustLevel = is_insgx:InSgx | OutSgx |
| |
| print_theorems |
| |
| interpretation TrustLevel : TrustLevel InSgx OutSgx is_insgx |
| proof |
| show "is_insgx InSgx" by auto |
| next |
| show "\<not> is_insgx OutSgx" by auto |
| next |
| fix x |
| show "x = InSgx \<or> x = OutSgx" |
| proof (cases x) |
| assume "x=InSgx" |
| from this show "x = InSgx \<or> x = OutSgx" by auto |
| next |
| assume "x=OutSgx" |
| from this show "x = InSgx \<or> x = OutSgx" by auto |
| qed |
| qed |
| |
| end |
