1 | //===----------------------------------------------------------------------===// |
2 | // |
3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
4 | // See https://llvm.org/LICENSE.txt for license information. |
5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
6 | // |
7 | //===----------------------------------------------------------------------===// |
8 | |
9 | // type_traits |
10 | |
11 | // is_base_of |
12 | |
13 | #include <type_traits> |
14 | |
15 | #include "test_macros.h" |
16 | |
17 | template <class T, class U> |
18 | void test_is_base_of() |
19 | { |
20 | static_assert((std::is_base_of<T, U>::value), "" ); |
21 | static_assert((std::is_base_of<const T, U>::value), "" ); |
22 | static_assert((std::is_base_of<T, const U>::value), "" ); |
23 | static_assert((std::is_base_of<const T, const U>::value), "" ); |
24 | #if TEST_STD_VER > 14 |
25 | static_assert((std::is_base_of_v<T, U>), "" ); |
26 | static_assert((std::is_base_of_v<const T, U>), "" ); |
27 | static_assert((std::is_base_of_v<T, const U>), "" ); |
28 | static_assert((std::is_base_of_v<const T, const U>), "" ); |
29 | #endif |
30 | } |
31 | |
32 | template <class T, class U> |
33 | void test_is_not_base_of() |
34 | { |
35 | static_assert((!std::is_base_of<T, U>::value), "" ); |
36 | } |
37 | |
38 | struct B {}; |
39 | struct B1 : B {}; |
40 | struct B2 : B {}; |
41 | struct D : private B1, private B2 {}; |
42 | struct I0; // incomplete |
43 | |
44 | int main(int, char**) |
45 | { |
46 | test_is_base_of<B, D>(); |
47 | test_is_base_of<B1, D>(); |
48 | test_is_base_of<B2, D>(); |
49 | test_is_base_of<B, B1>(); |
50 | test_is_base_of<B, B2>(); |
51 | test_is_base_of<B, B>(); |
52 | |
53 | test_is_not_base_of<D, B>(); |
54 | test_is_not_base_of<B&, D&>(); |
55 | test_is_not_base_of<B[3], D[3]>(); |
56 | test_is_not_base_of<int, int>(); |
57 | |
58 | // A scalar is never the base class of anything (including incomplete types) |
59 | test_is_not_base_of<int, B>(); |
60 | test_is_not_base_of<int, B1>(); |
61 | test_is_not_base_of<int, B2>(); |
62 | test_is_not_base_of<int, D>(); |
63 | test_is_not_base_of<int, I0>(); |
64 | |
65 | // A scalar never has base classes (including incomplete types) |
66 | test_is_not_base_of<B, int>(); |
67 | test_is_not_base_of<B1, int>(); |
68 | test_is_not_base_of<B2, int>(); |
69 | test_is_not_base_of<D, int>(); |
70 | test_is_not_base_of<I0, int>(); |
71 | |
72 | return 0; |
73 | } |
74 | |