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
27class Base {
28 public:
29 virtual ~Base() {}
30 virtual int foo() const {
31 return 1;
32 }
33};
34
35class 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.
45int fooBase(const Base* p) {
46 return p->foo() + 1;
47}
48int fooDerived(const Derived* p) {
49 return p->foo() + 1;
50}
51
52TEST(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