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// UNSUPPORTED: c++03
10// UNSUPPORTED: no-exceptions
11
12#include <cassert>
13#include <cstddef>
14#include <cstdlib>
15#include <type_traits>
16
17struct A {};
18
19template<typename T, bool CanCatchNullptr>
20static void catch_nullptr_test() {
21 try {
22 throw nullptr;
23 } catch (T &p) {
24 assert(CanCatchNullptr && !static_cast<bool>(p));
25 } catch (...) {
26 assert(!CanCatchNullptr);
27 }
28}
29
30int main(int, char**)
31{
32 static_assert(std::is_same<std::nullptr_t, decltype(nullptr)>::value, "");
33
34 // A reference to nullptr_t can catch nullptr.
35 catch_nullptr_test<std::nullptr_t, true>();
36 catch_nullptr_test<const std::nullptr_t, true>();
37 catch_nullptr_test<volatile std::nullptr_t, true>();
38 catch_nullptr_test<const volatile std::nullptr_t, true>();
39
40 // No other reference type can.
41#if 0
42 // FIXME: These tests fail, because the ABI provides no way for us to
43 // distinguish this from catching by value.
44 catch_nullptr_test<void *, false>();
45 catch_nullptr_test<void * const, false>();
46 catch_nullptr_test<int *, false>();
47 catch_nullptr_test<A *, false>();
48 catch_nullptr_test<int A::*, false>();
49 catch_nullptr_test<int (A::*)(), false>();
50#endif
51
52 return 0;
53}
54

source code of libcxxabi/test/catch_reference_nullptr.pass.cpp