1 | /* |
2 | * Copyright 2012-present Facebook, Inc. |
3 | * |
4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
5 | * you may not use this file except in compliance with the License. |
6 | * You may obtain a copy of the License at |
7 | * |
8 | * http://www.apache.org/licenses/LICENSE-2.0 |
9 | * |
10 | * Unless required by applicable law or agreed to in writing, software |
11 | * distributed under the License is distributed on an "AS IS" BASIS, |
12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
13 | * See the License for the specific language governing permissions and |
14 | * limitations under the License. |
15 | */ |
16 | |
17 | #include <folly/Portability.h> |
18 | |
19 | #if FOLLY_HAS_STRING_VIEW |
20 | #include <string_view> // @manual |
21 | #endif |
22 | |
23 | #include <memory> |
24 | |
25 | #include <folly/portability/GTest.h> |
26 | |
27 | class Base { |
28 | public: |
29 | virtual ~Base() {} |
30 | virtual int foo() const { |
31 | return 1; |
32 | } |
33 | }; |
34 | |
35 | class Derived : public Base { |
36 | public: |
37 | int foo() const final { |
38 | return 2; |
39 | } |
40 | }; |
41 | |
42 | // A compiler that supports final will likely inline the call to p->foo() |
43 | // in fooDerived (but not in fooBase) as it knows that Derived::foo() can |
44 | // no longer be overridden. |
45 | int fooBase(const Base* p) { |
46 | return p->foo() + 1; |
47 | } |
48 | int fooDerived(const Derived* p) { |
49 | return p->foo() + 1; |
50 | } |
51 | |
52 | TEST(Portability, Final) { |
53 | std::unique_ptr<Derived> p(new Derived); |
54 | EXPECT_EQ(3, fooBase(p.get())); |
55 | EXPECT_EQ(3, fooDerived(p.get())); |
56 | } |
57 | |