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
