1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
|
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03
// UNSUPPORTED: no-exceptions
#include <cassert>
#include <cstddef>
#include <cstdlib>
#include <type_traits>
struct A {};
template<typename T, bool CanCatchNullptr>
static void catch_nullptr_test() {
try {
throw nullptr;
} catch (T &p) {
assert(CanCatchNullptr && !static_cast<bool>(p));
} catch (...) {
assert(!CanCatchNullptr);
}
}
int main(int, char**)
{
static_assert(std::is_same<std::nullptr_t, decltype(nullptr)>::value, "");
// A reference to nullptr_t can catch nullptr.
catch_nullptr_test<std::nullptr_t, true>();
catch_nullptr_test<const std::nullptr_t, true>();
catch_nullptr_test<volatile std::nullptr_t, true>();
catch_nullptr_test<const volatile std::nullptr_t, true>();
// No other reference type can.
#if 0
// FIXME: These tests fail, because the ABI provides no way for us to
// distinguish this from catching by value.
catch_nullptr_test<void *, false>();
catch_nullptr_test<void * const, false>();
catch_nullptr_test<int *, false>();
catch_nullptr_test<A *, false>();
catch_nullptr_test<int A::*, false>();
catch_nullptr_test<int (A::*)(), false>();
#endif
return 0;
}
|
