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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// type_traits
// is_base_of
#include <type_traits>
#include "test_macros.h"
// Clang before v9 and apple-clang up to and including v10 do not
// report that unions are never base classes - nor can they have bases.
// See
// XFAIL: apple-clang-6.0, apple-clang-7.0, apple-clang-8.0, apple-clang-9.0, apple-clang-10.0
// XFAIL: clang-3.3, clang-3.4, clang-3.5, clang-3.6, clang-3.7, clang-3.8, clang-3.9
// XFAIL: clang-4.0, clang-5.0, clang-6.0, clang-7.0, clang-8.0
template <class T, class U>
void test_is_base_of()
static_assert((std::is_base_of<T, U>::value), "");
static_assert((std::is_base_of<const T, U>::value), "");
static_assert((std::is_base_of<T, const U>::value), "");
static_assert((std::is_base_of<const T, const U>::value), "");
#if TEST_STD_VER > 14
static_assert((std::is_base_of_v<T, U>), "");
static_assert((std::is_base_of_v<const T, U>), "");
static_assert((std::is_base_of_v<T, const U>), "");
static_assert((std::is_base_of_v<const T, const U>), "");
template <class T, class U>
void test_is_not_base_of()
static_assert((!std::is_base_of<T, U>::value), "");
struct B {};
struct B1 : B {};
struct B2 : B {};
struct D : private B1, private B2 {};
union U0;
union U1 {};
struct I0;
struct I1 {};
int main(int, char**)
// A union is never the base class of anything (including incomplete types)
test_is_not_base_of<U0, B>();
test_is_not_base_of<U0, B1>();
test_is_not_base_of<U0, B2>();
test_is_not_base_of<U0, D>();
test_is_not_base_of<U1, B>();
test_is_not_base_of<U1, B1>();
test_is_not_base_of<U1, B2>();
test_is_not_base_of<U1, D>();
test_is_not_base_of<U0, I0>();
test_is_not_base_of<U1, I1>();
test_is_not_base_of<U0, U1>();
test_is_not_base_of<U0, int>();
test_is_not_base_of<U1, int>();
test_is_not_base_of<I0, int>();
test_is_not_base_of<I1, int>();
// A union never has base classes (including incomplete types)
test_is_not_base_of<B, U0>();
test_is_not_base_of<B1, U0>();
test_is_not_base_of<B2, U0>();
test_is_not_base_of<D, U0>();
test_is_not_base_of<B, U1>();
test_is_not_base_of<B1, U1>();
test_is_not_base_of<B2, U1>();
test_is_not_base_of<D, U1>();
test_is_not_base_of<I0, U0>();
test_is_not_base_of<I1, U1>();
test_is_not_base_of<U1, U0>();
test_is_not_base_of<int, U0>();
test_is_not_base_of<int, U1>();
test_is_not_base_of<int, I0>();
test_is_not_base_of<int, I1>();
return 0;