| 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 | |