1 //===--------------------- catch_pointer_nullptr.cpp ----------------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 // UNSUPPORTED: c++98, c++03, libcxxabi-no-exceptions
11 
12 #include <cassert>
13 #include <cstdlib>
14 
15 struct A {};
16 
17 template<typename T, bool CanCatchNullptr>
18 static void catch_nullptr_test() {
19   try {
20     throw nullptr;
21   } catch (T &p) {
22     assert(CanCatchNullptr && !static_cast<bool>(p));
23   } catch (...) {
24     assert(!CanCatchNullptr);
25   }
26 }
27 
28 int main()
29 {
30   using nullptr_t = decltype(nullptr);
31 
32   // A reference to nullptr_t can catch nullptr.
33   catch_nullptr_test<nullptr_t, true>();
34   catch_nullptr_test<const nullptr_t, true>();
35   catch_nullptr_test<volatile nullptr_t, true>();
36   catch_nullptr_test<const volatile nullptr_t, true>();
37 
38   // No other reference type can.
39 #if 0
40   // FIXME: These tests fail, because the ABI provides no way for us to
41   // distinguish this from catching by value.
42   catch_nullptr_test<void *, false>();
43   catch_nullptr_test<void * const, false>();
44   catch_nullptr_test<int *, false>();
45   catch_nullptr_test<A *, false>();
46   catch_nullptr_test<int A::*, false>();
47   catch_nullptr_test<int (A::*)(), false>();
48 #endif
49 }
50