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Sometimes libc++'s stddef.h wrapper gets included, which defines ::nullptr_t. This test is compiled with -Wshadow -Werror, so shadowing ::nullptr_t with a nullptr_t in main is an error. Include cstddef, which is guaranteed to define std::nullptr_t in C++11 and forward. Reviewed By: ldionne, #libc_abi Differential Revision: https://reviews.llvm.org/D137127
54 lines
1.5 KiB
C++
54 lines
1.5 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: c++03
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// UNSUPPORTED: no-exceptions
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#include <cassert>
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#include <cstddef>
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#include <cstdlib>
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#include <type_traits>
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struct A {};
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template<typename T, bool CanCatchNullptr>
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static void catch_nullptr_test() {
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try {
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throw nullptr;
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} catch (T &p) {
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assert(CanCatchNullptr && !static_cast<bool>(p));
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} catch (...) {
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assert(!CanCatchNullptr);
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}
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}
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int main(int, char**)
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{
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static_assert(std::is_same<std::nullptr_t, decltype(nullptr)>::value, "");
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// A reference to nullptr_t can catch nullptr.
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catch_nullptr_test<std::nullptr_t, true>();
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catch_nullptr_test<const std::nullptr_t, true>();
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catch_nullptr_test<volatile std::nullptr_t, true>();
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catch_nullptr_test<const volatile std::nullptr_t, true>();
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// No other reference type can.
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#if 0
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// FIXME: These tests fail, because the ABI provides no way for us to
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// distinguish this from catching by value.
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catch_nullptr_test<void *, false>();
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catch_nullptr_test<void * const, false>();
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catch_nullptr_test<int *, false>();
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catch_nullptr_test<A *, false>();
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catch_nullptr_test<int A::*, false>();
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catch_nullptr_test<int (A::*)(), false>();
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#endif
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return 0;
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}
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